UserAgent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/58.0.3029.81 Safari/537.36

Steps to reproduce the problem:
git checkout -f master
gclient runhooks
git rebase-update                                                                                                                                         
gclient sync
ninja -t clean
gn gen out/Default

cat > out/Default/args.gn << EOF
google_api_key = ...
google_default_client_id = ...
google_default_client_secret = ...
target_cpu = "x64"
is_debug = false
is_component_build = false
symbol_level = 0
enable_nacl = false
remove_webcore_debug_symbols = true
linux_use_bundled_binutils=false
use_debug_fission=false
is_clang=false
use_sysroot=false
treat_warnings_as_errors=false
EOF

ninja -C out/Default chrome

What is the expected behavior?
Build completes with a successful link of Chromius

What went wrong?
[7930/25688] CXX obj/third_party/swiftshader/src/Main/swiftshader_main/FrameBuffer.o
FAILED: obj/third_party/swiftshader/src/Main/swiftshader_main/FrameBuffer.o 
g++ -MMD -MF obj/third_party/swiftshader/src/Main/swiftshader_main/FrameBuffer.o.d -DV8_DEPRECATION_WARNINGS -DUSE_UDEV -DUSE_AURA=1 -DUSE_PANGO=1 -DUSE_CAIRO=1 -DUSE_GLIB=1 -DUSE_NSS_CERTS=1 -DUSE_X11=1 -DDISABLE_NACL -DFULL_SAFE_BROWSING -DSAFE_BROWSING_CSD -DSAFE_BROWSING_DB_LOCAL -DCHROMIUM_BUILD -DFIELDTRIAL_TESTING_ENABLED -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D__STDC_CONSTANT_MACROS -D__STDC_FORMAT_MACROS -D_FORTIFY_SOURCE=2 -DNDEBUG -DNVALGRIND -DDYNAMIC_ANNOTATIONS_ENABLED=0 -DLOG_TAG=\"swiftshader_main\" -I../../third_party/swiftshader/src -I../../third_party/swiftshader/src/Common -I../.. -Igen -fno-strict-aliasing --param=ssp-buffer-size=4 -fstack-protector -Wno-builtin-macro-redefined -D__DATE__= -D__TIME__= -D__TIMESTAMP__= -funwind-tables -fPIC -pipe -m64 -march=x86-64 -pthread -Wall -Wno-unused-local-typedefs -Wno-maybe-uninitialized -Wno-missing-field-initializers -Wno-unused-parameter -O2 -fno-ident -fdata-sections -ffunction-sections -fomit-frame-pointer -g0 -fvisibility=hidden -msse2 -fvisibility-inlines-hidden -std=gnu++11 -Wno-narrowing -fno-rtti -fno-exceptions -c ../../third_party/swiftshader/src/Main/FrameBuffer.cpp -o obj/third_party/swiftshader/src/Main/swiftshader_main/FrameBuffer.o
In file included from ../../third_party/swiftshader/src/Common/Resource.hpp:18:0,
                 from ../../third_party/swiftshader/src/Renderer/Surface.hpp:20,
                 from ../../third_party/swiftshader/src/Main/FrameBuffer.hpp:19,
                 from ../../third_party/swiftshader/src/Main/FrameBuffer.cpp:15:
../../third_party/swiftshader/src/Common/MutexLock.hpp:167:22: error: member ‘std::atomic<bool> sw::BackoffLock::<anonymous struct>::mutex’ with constructor not allowed in anonymous aggregate
    std::atomic<bool> mutex;
                      ^

Did this work before? Yes I had built Chromium just a few days back on the same system using the same steps

Chrome version: 58.0.3029.81  Channel: dev
OS Version: 
Flash Version: Shockwave Flash 25.0 r0

cat /etc/lsb-release 
DISTRIB_ID=Ubuntu
DISTRIB_RELEASE=16.04
DISTRIB_CODENAME=xenial
DISTRIB_DESCRIPTION="Ubuntu 16.04.2 LTS"

uname -r
4.4.0-72-generic

System fully updated with latest available packages