Compile failure observed in official.desktop.continuous Win, Mac, Linux Beta builder.

Link to the builder:
=====================
https://uberchromegw.corp.google.com/i/official.desktop.continuous/builders/linux64%20beta/builds/3712

Link to the log file:
=====================
https://logs.chromium.org/v/?s=chrome%2Fbb%2Fofficial.desktop.continuous%2Flinux64_beta%2F3712%2F%2B%2Frecipes%2Fsteps%2Fcompile%2F0%2Fstdout

Error log
=========

FAILED: obj/chrome/test/browser_tests/hosted_app_browsertest.o 
../../third_party/llvm-build/Release+Asserts/bin/clang++ -MMD -MF obj/chrome/test/browser_tests/hosted_app_browsertest.o.d -DHAS_OUT_OF_PROC_TEST_RUNNER -DV8_DEPRECATION_WARNINGS -DUSE_UDEV -DUSE_AURA=1 -DUSE_GLIB=1 -DUSE_NSS_CERTS=1 -DUSE_X11=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=\"325667-1\" -D__STDC_CONSTANT_MACROS -D__STDC_FORMAT_MACROS -D_FORTIFY_SOURCE=2 -D_LIBCPP_DISABLE_VISIBILITY_ANNOTATIONS -D_LIBCXXABI_DISABLE_VISIBILITY_ANNOTATIONS -DNDEBUG -DNVALGRIND -DDYNAMIC_ANNOTATIONS_ENABLED=0 -DGLIB_VERSION_MAX_ALLOWED=GLIB_VERSION_2_32 -DGLIB_VERSION_MIN_REQUIRED=GLIB_VERSION_2_26 -DGTEST_API_= -DGTEST_HAS_POSIX_RE=0 -DGTEST_LANG_CXX11=1 -DGTEST_HAS_TR1_TUPLE=1 -DWEBP_EXTERN=extern -DGL_GLEXT_PROTOTYPES -DUSE_GLX -DUSE_EGL -DTOOLKIT_VIEWS=1 -DEXPAT_RELATIVE_PATH -DU_USING_ICU_NAMESPACE=0 -DU_ENABLE_DYLOAD=0 -DU_STATIC_IMPLEMENTATION -DICU_UTIL_DATA_IMPL=ICU_UTIL_DATA_FILE -DUCHAR_TYPE=uint16_t -DGOOGLE_PROTOBUF_NO_RTTI -DGOOGLE_PROTOBUF_NO_STATIC_INITIALIZER -DHAVE_PTHREAD -DV8_USE_EXTERNAL_STARTUP_DATA -DLEVELDB_PLATFORM_CHROMIUM=1 -DSK_IGNORE_LINEONLY_AA_CONVEX_PATH_OPTS -DSK_HAS_PNG_LIBRARY -DSK_HAS_WEBP_LIBRARY -DSK_HAS_JPEG_LIBRARY -DSK_SUPPORT_GPU=1 -DI18N_ADDRESS_VALIDATION_DATA_URL=\"https://chromium-i18n.appspot.com/ssl-aggregate-address/\" -DWEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS=0 -DGTEST_RELATIVE_PATH -DWEBRTC_CHROMIUM_BUILD -DWEBRTC_POSIX -DWEBRTC_LINUX -DUNIT_TEST -DWTF_USE_WEBAUDIO_FFMPEG=1 -DWTF_USE_DEFAULT_RENDER_THEME=1 -DUSE_LIBJPEG_TURBO=1 -I../.. -Igen -I../../third_party/googletest/src/googletest/include -I../../third_party/libwebp/src -I../../third_party/khronos -I../../gpu -I../../third_party/libyuv/include -I../../third_party/webrtc_overrides -I../../testing/gtest/include -I../../third_party/libyuv/include -I../../third_party/usrsctp/usrsctplib -I../../third_party/webrtc -I../../third_party/ced/src -I../../third_party/icu/source/common -I../../third_party/icu/source/i18n -I../../third_party/protobuf/src -I../../third_party/protobuf/src -Igen/protoc_out -I../../third_party/boringssl/src/include -I../../third_party/leveldatabase -I../../third_party/leveldatabase/src -I../../third_party/leveldatabase/src/include -I../../skia/config -I../../skia/ext -I../../third_party/skia/include/c -I../../third_party/skia/include/config -I../../third_party/skia/include/core -I../../third_party/skia/include/effects -I../../third_party/skia/include/encode -I../../third_party/skia/include/gpu -I../../third_party/skia/include/images -I../../third_party/skia/include/lazy -I../../third_party/skia/include/pathops -I../../third_party/skia/include/pdf -I../../third_party/skia/include/pipe -I../../third_party/skia/include/ports -I../../third_party/skia/include/utils -I../../third_party/skia/src/gpu -I../../third_party/skia/src/sksl -I../../third_party/libwebm/source -I../../third_party/WebKit -Igen/third_party/WebKit -I../../v8/include -Igen/v8/include -Igen/third_party/metrics_proto -I../../third_party/re2/src -I../../third_party/mesa/src/include -Igen -Igen -I../../third_party/libaddressinput/src/cpp/include -I../../third_party/webrtc_overrides -I../../third_party/webrtc -I../../third_party/googletest/custom -I../../third_party/googletest/src/googlemock/include -I../../third_party/cacheinvalidation/overrides -I../../third_party/cacheinvalidation/src -I../../third_party/flatbuffers/src/include -I../../third_party/WebKit/Source -I../../third_party/WebKit -Igen/blink -Igen/third_party/WebKit -I../../third_party/libjpeg_turbo -I../../third_party/iccjpeg -I../../third_party/libpng -I../../third_party/zlib -I../../third_party/ots/include -I../../v8/include -Igen/v8/include -I../../third_party/webrtc_overrides -I../../testing/gtest/include -I../../third_party/webrtc -fno-strict-aliasing --param=ssp-buffer-size=4 -fstack-protector -fno-unwind-tables -fno-asynchronous-unwind-tables -fPIC -pipe -B../../third_party/binutils/Linux_x64/Release/bin -pthread -fcolor-diagnostics -Xclang -mllvm -Xclang -instcombine-lower-dbg-declare=0 -no-canonical-prefixes -flto=thin -fwhole-program-vtables -m64 -march=x86-64 -Wall -Werror -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-inconsistent-missing-override -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 -O2 -fno-ident -fdata-sections -ffunction-sections -fno-omit-frame-pointer -g2 -ggnu-pubnames -fsanitize=cfi-vcall -fsanitize-blacklist=../../tools/cfi/blacklist.txt -fvisibility=hidden -Xclang -load -Xclang ../../third_party/llvm-build/Release+Asserts/lib/libFindBadConstructs.so -Xclang -add-plugin -Xclang find-bad-constructs -Xclang -plugin-arg-find-bad-constructs -Xclang check-ipc -Wheader-hygiene -Wstring-conversion -Wtautological-overlap-compare -isystem/b/c/b/linux64_beta/src/build/linux/debian_sid_amd64-sysroot/usr/include/glib-2.0 -isystem/b/c/b/linux64_beta/src/build/linux/debian_sid_amd64-sysroot/usr/lib/x86_64-linux-gnu/glib-2.0/include -Wno-header-guard -isystem/b/c/b/linux64_beta/src/build/linux/debian_sid_amd64-sysroot/usr/include/nss -isystem/b/c/b/linux64_beta/src/build/linux/debian_sid_amd64-sysroot/usr/include/nspr -Wno-exit-time-destructors -Xclang -load -Xclang ../../third_party/llvm-build/Release+Asserts/lib/libBlinkGCPlugin.so -Xclang -add-plugin -Xclang blink-gc-plugin -std=gnu++14 -fno-exceptions -fno-rtti -nostdinc++ -isystem../../buildtools/third_party/libc++/trunk/include -isystem../../buildtools/third_party/libc++abi/trunk/include --sysroot=../../build/linux/debian_sid_amd64-sysroot -fvisibility-inlines-hidden -c ../../chrome/browser/ui/extensions/hosted_app_browsertest.cc -o obj/chrome/test/browser_tests/hosted_app_browsertest.o
../../chrome/browser/ui/extensions/hosted_app_browsertest.cc:340:3: error: use of undeclared identifier 'app_'
  app_ = InstallBookmarkApp(web_app_info)


Possible suspect
=================
https://chromium.googlesource.com/chromium/src/+/a854a5e7aebc93dfe1dc3d77aeebdcd62ad048a6

Assigning to CL owner further updates.

Note : Similar bot failure was observed previously, Issue 831023 but the error log was different.

Alex, would you mind taking a look ASAP.