First failure on the afternoon of June 13:
https://uberchromegw.corp.google.com/i/chromeos_release/builders/samus-chrome-pre-flight-branch%20release-R68-10718.B/builds/68

https://logs.chromium.org/v/?s=chromeos%2Fbb%2Fchromeos_release%2Fsamus-chrome-pre-flight-branch_release-R68-10718.B%2F68%2F%2B%2Frecipes%2Fsteps%2FBuildPackages%2F0%2Fstdout
...
chromeos-chrome-68.0.3440.26_rc-r1: FAILED: obj/components/arc/arc_base/arc_session_impl.o 
chromeos-chrome-68.0.3440.26_rc-r1: /home/chrome-bot/goma/gomacc x86_64-cros-linux-gnu-clang++ -B/usr/x86_64-pc-linux-gnu/x86_64-cros-linux-gnu/binutils-bin/2.27.0-gold -MMD -MF obj/components/arc/arc_base/arc_session_impl.o.d -DV8_DEPRECATION_WARNINGS -DUSE_UDEV -DUSE_AURA=1 -DUSE_NSS_CERTS=1 -DUSE_OZONE=1 -DFULL_SAFE_BROWSING -DSAFE_BROWSING_CSD -DSAFE_BROWSING_DB_LOCAL -DOFFICIAL_BUILD -DGOOGLE_CHROME_BUILD -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -DNO_UNWIND_TABLES -DCR_CLANG_REVISION=\"332838-1\" -D__STDC_CONSTANT_MACROS -D__STDC_FORMAT_MACROS -D_FORTIFY_SOURCE=2 -DCR_SYSROOT_HASH=4e7db513b0faeea8fb410f70c9909e8736f5c0ab -DOS_CHROMEOS -DNDEBUG -DNVALGRIND -DDYNAMIC_ANNOTATIONS_ENABLED=0 -DWEBP_EXTERN=extern -DUSE_EGL -DTOOLKIT_VIEWS=1 -DSK_IGNORE_LINEONLY_AA_CONVEX_PATH_OPTS -DSK_HAS_PNG_LIBRARY -DSK_HAS_WEBP_LIBRARY -DSK_HAS_JPEG_LIBRARY -DSK_SUPPORT_GPU=1 -DSK_GPU_WORKAROUNDS_HEADER=\"gpu/config/gpu_driver_bug_workaround_autogen.h\" -DGOOGLE_PROTOBUF_NO_RTTI -DGOOGLE_PROTOBUF_NO_STATIC_INITIALIZER -DHAVE_PTHREAD -DLEVELDB_PLATFORM_CHROMIUM=1 -DMESA_EGL_NO_X11_HEADERS -DU_USING_ICU_NAMESPACE=0 -DU_ENABLE_DYLOAD=0 -DU_STATIC_IMPLEMENTATION -DICU_UTIL_DATA_IMPL=ICU_UTIL_DATA_FILE -DUCHAR_TYPE=uint16_t -DWEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS=0 -DGTEST_RELATIVE_PATH -DWEBRTC_CHROMIUM_BUILD -DWEBRTC_POSIX -DWEBRTC_LINUX -DCHROMEOS -DNO_MAIN_THREAD_WRAPPING -DV8_USE_EXTERNAL_STARTUP_DATA -I../../../../../../../home/chrome-bot/chrome_root/src -Igen -I../../../../../../../home/chrome-bot/chrome_root/src/third_party/libwebp/src -I../../../../../../../home/chrome-bot/chrome_root/src/third_party/libyuv/include -I../../../../../../../home/chrome-bot/chrome_root/src/third_party/khronos -I../../../../../../../home/chrome-bot/chrome_root/src/gpu -I../../../../../../../home/chrome-bot/chrome_root/src/third_party/libwebm/source -I../../../../../../../home/chrome-bot/chrome_root/src/skia/config -I../../../../../../../home/chrome-bot/chrome_root/src/skia/ext -I../../../../../../../home/chrome-bot/chrome_root/src/third_party/skia/include/c -I../../../../../../../home/chrome-bot/chrome_root/src/third_party/skia/include/config -I../../../../../../../home/chrome-bot/chrome_root/src/third_party/skia/include/core -I../../../../../../../home/chrome-bot/chrome_root/src/third_party/skia/include/effects -I../../../../../../../home/chrome-bot/chrome_root/src/third_party/skia/include/encode -I../../../../../../../home/chrome-bot/chrome_root/src/third_party/skia/include/gpu -I../../../../../../../home/chrome-bot/chrome_root/src/third_party/skia/include/images -I../../../../../../../home/chrome-bot/chrome_root/src/third_party/skia/include/lazy -I../../../../../../../home/chrome-bot/chrome_root/src/third_party/skia/include/pathops -I../../../../../../../home/chrome-bot/chrome_root/src/third_party/skia/include/pdf -I../../../../../../../home/chrome-bot/chrome_root/src/third_party/skia/include/pipe -I../../../../../../../home/chrome-bot/chrome_root/src/third_party/skia/include/ports -I../../../../../../../home/chrome-bot/chrome_root/src/third_party/skia/include/utils -I../../../../../../../home/chrome-bot/chrome_root/src/third_party/skia/src/gpu -I../../../../../../../home/chrome-bot/chrome_root/src/third_party/skia/src/sksl -I../../../../../../../home/chrome-bot/chrome_root/src/third_party/protobuf/src -Igen/protoc_out -I../../../../../../../home/chrome-bot/chrome_root/src/third_party/protobuf/src -I../../../../../../../home/chrome-bot/chrome_root/src/third_party/leveldatabase -I../../../../../../../home/chrome-bot/chrome_root/src/third_party/leveldatabase/src -I../../../../../../../home/chrome-bot/chrome_root/src/third_party/leveldatabase/src/include -I../../../../../../../home/chrome-bot/chrome_root/src/third_party/mesa/src/include -I../../../../../../../home/chrome-bot/chrome_root/src/third_party/ced/src -I../../../../../../../home/chrome-bot/chrome_root/src/third_party/icu/source/common -I../../../../../../../home/chrome-bot/chrome_root/src/third_party/icu/source/i18n -I../../../../../../../home/chrome-bot/chrome_root/src/third_party/boringssl/src/include -I../../../../../../../home/chrome-bot/chrome_root/src/v8/include -Igen/v8/include -I../../../../../../../home/chrome-bot/chrome_root/src/third_party/webrtc_overrides -I../../../../../../../home/chrome-bot/chrome_root/src/third_party/webrtc -fno-strict-aliasing -fno-unwind-tables -fno-asynchronous-unwind-tables -fPIC -pipe -pthread -fcolor-diagnostics -fmerge-all-constants -fdebug-prefix-map=/var/cache/chromeos-chrome/chrome-src-internal/src/out_samus/Release=. -no-canonical-prefixes -m64 -march=x86-64 -Wall -Wextra -Wimplicit-fallthrough -Wthread-safety -Wno-missing-field-initializers -Wno-unused-parameter -Wno-c++11-narrowing -Wno-covered-switch-default -Wno-unneeded-internal-declaration -Wno-undefined-var-template -Wno-nonportable-include-path -Wno-address-of-packed-member -Wno-unused-lambda-capture -Wno-user-defined-warnings -Wno-enum-compare-switch -Wno-null-pointer-arithmetic -Wno-ignored-pragma-optimize -O2 -fno-ident -fdata-sections -ffunction-sections -fno-omit-frame-pointer -g2 -ggnu-pubnames -fvisibility=hidden -Wheader-hygiene -Wstring-conversion -Wtautological-overlap-compare -Wno-header-guard -isystem../../../../../../../build/samus/usr/include/nss -isystem../../../../../../../build/samus/usr/include/nspr -isystem../../../../../../../build/samus/usr/include/dbus-1.0 -isystem../../../../../../../build/samus/usr/lib64/dbus-1.0/include -std=gnu++14 -fno-exceptions -fno-rtti --sysroot=../../../../../../../build/samus -fvisibility-inlines-hidden -pipe -pipe -pipe -march=corei7 -fdebug-info-for-profiling -D__google_stl_debug_vector=1 -Wno-unknown-warning-option -stdlib=libc++  -c ../../../../../../../home/chrome-bot/chrome_root/src/components/arc/arc_session_impl.cc -o obj/components/arc/arc_base/arc_session_impl.o
chromeos-chrome-68.0.3440.26_rc-r1: ../../../../../../../home/chrome-bot/chrome_root/src/components/arc/arc_session_impl.cc:373:11: error: no member named 'set_locale' in 'login_manager::UpgradeArcContainerRequest'
chromeos-chrome-68.0.3440.26_rc-r1:   request.set_locale(locale_);
chromeos-chrome-68.0.3440.26_rc-r1:   ~~~~~~~ ^
chromeos-chrome-68.0.3440.26_rc-r1: ../../../../../../../home/chrome-bot/chrome_root/src/components/arc/arc_session_impl.cc:375:13: error: no member named 'add_preferred_languages' in 'login_manager::UpgradeArcContainerRequest'
chromeos-chrome-68.0.3440.26_rc-r1:     request.add_preferred_languages(language);
chromeos-chrome-68.0.3440.26_rc-r1:     ~~~~~~~ ^
chromeos-chrome-68.0.3440.26_rc-r1: 2 errors generated.
chromeos-chrome-68.0.3440.26_rc-r1: 
...

Maybe related to https://b.corp.google.com/issues/67734479 ?

It looks like this bug merged stuff into 68 without merge review?