Link to Builds:
===============
https://uberchromegw.corp.google.com/i/official.desktop.continuous/builders/mac%20trunk/builds/46152

Link to Log File:
=================
https://uberchromegw.corp.google.com/i/official.desktop.continuous/builders/mac%20trunk/builds/46152/steps/compile/logs/stdio

Error from the Log:
===================
FAILED: obj/third_party/WebKit/Source/core/frame/frame/DOMTimerCoordinator.o 
export DEVELOPER_DIR=/b/build/slave/mac_trunk/build/src/build/mac_files/Xcode.app;  ../../third_party/llvm-build/Release+Asserts/bin/clang++ -MMD -MF obj/third_party/WebKit/Source/core/frame/frame/DOMTimerCoordinator.o.d -DV8_DEPRECATION_WARNINGS -DNO_TCMALLOC -DUSE_EXTERNAL_POPUP_MENU=1 -DFULL_SAFE_BROWSING -DSAFE_BROWSING_CSD -DSAFE_BROWSING_DB_LOCAL -DOFFICIAL_BUILD -DGOOGLE_CHROME_BUILD -DENABLE_MEDIA_ROUTER=1 -DCR_CLANG_REVISION=\"289944-2\" -DCR_XCODE_VERSION=0511 -D__STDC_CONSTANT_MACROS -D__STDC_FORMAT_MACROS -D_FORTIFY_SOURCE=2 -D__ASSERT_MACROS_DEFINE_VERSIONS_WITHOUT_UNDERSCORE=0 -DNDEBUG -DNVALGRIND -DDYNAMIC_ANNOTATIONS_ENABLED=0 -DBLINK_CORE_IMPLEMENTATION=1 -DBLINK_IMPLEMENTATION=1 -DINSIDE_BLINK -DSK_IGNORE_DW_GRAY_FIX -DSK_IGNORE_DIRECTWRITE_GASP_FIX -DSK_IGNORE_LINEONLY_AA_CONVEX_PATH_OPTS -DSK_SUPPORT_GPU=1 -DSK_BUILD_FOR_MAC -DENABLE_LAYOUT_UNIT_IN_INLINE_BOXES=0 -DENABLE_OILPAN=1 -DWTF_USE_CONCATENATED_IMPULSE_RESPONSES=1 -DU_USING_ICU_NAMESPACE=0 -DU_ENABLE_DYLOAD=0 -DU_STATIC_IMPLEMENTATION -DICU_UTIL_DATA_IMPL=ICU_UTIL_DATA_FILE -DLIBXSLT_STATIC -I../.. -Igen -I../../third_party/WebKit/Source -I../../third_party/WebKit -Igen/blink -Igen/third_party/WebKit -I../../third_party/khronos -I../../gpu -I../../third_party/libwebp -I../../third_party/WebKit/Source -Igen/blink -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/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/include/gpu -I../../third_party/skia/src/gpu -I../../third_party/skia/src/sksl -I../../third_party/icu/source/common -I../../third_party/icu/source/i18n -I../../third_party/angle/include -I../../third_party/angle/src/common/third_party/numerics -Igen/angle -I../../third_party/iccjpeg -I../../third_party/libpng -I../../third_party/zlib -I../../third_party/libxml/src/include -I../../third_party/libxml/mac/include -I../../third_party/libxslt -I../../third_party/ots/include -I../../third_party/snappy/src -I../../third_party/snappy/mac -I../../v8/include -Igen/v8/include -fno-strict-aliasing -fstack-protector -fcolor-diagnostics -arch x86_64 -Wall -Werror -Wextra -Wpartial-availability -Wno-missing-field-initializers -Wno-unused-parameter -Wno-c++11-narrowing -Wno-covered-switch-default -Wno-deprecated-register -Wno-unneeded-internal-declaration -Wno-inconsistent-missing-override -Wno-shift-negative-value -Wno-undefined-var-template -Wno-nonportable-include-path -Wno-address-of-packed-member -Wno-block-capture-autoreleasing -O2 -gdwarf-2 -fno-standalone-debug -isysroot /b/build/slave/mac_trunk/build/src/build/mac_files/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.10.sdk -mmacosx-version-min=10.9 -fvisibility=hidden -Xclang -load -Xclang ../../third_party/llvm-build/Release+Asserts/lib/libFindBadConstructs.dylib -Xclang -add-plugin -Xclang find-bad-constructs -Wheader-hygiene -Wstring-conversion -Wtautological-overlap-compare -Wexit-time-destructors -Xclang -load -Xclang ../../third_party/llvm-build/Release+Asserts/lib/libBlinkGCPlugin.dylib -Xclang -add-plugin -Xclang blink-gc-plugin -Wglobal-constructors -DLIBXML_STATIC= -fvisibility-inlines-hidden -std=c++11 -stdlib=libc++ -fno-rtti -fno-exceptions -include obj/third_party/WebKit/Source/core/frame/frame/Prefix.h-cc -c ../../third_party/WebKit/Source/core/frame/DOMTimerCoordinator.cpp -o obj/third_party/WebKit/Source/core/frame/frame/DOMTimerCoordinator.o
../../third_party/WebKit/Source/core/frame/DOMTimerCoordinator.cpp:26:25: error: unused variable 'result' [-Werror,-Wunused-variable]
  TimeoutMap::AddResult result = m_timers.insert(
                        ^
1 error generated.
[39796/50206] CXX obj/third_party/WebKit/Source/core/frame/frame/PlatformEventDispatcher.o
[39797/50206] CXX obj/third_party/WebKit/Source/core/frame/frame/PlatformEventController.o
[39798/50206] CXX obj/third_party/WebKit/Source/core/frame/frame/LayoutSubtreeRootList.o
[39799/50206] CXX obj/third_party/WebKit/Source/core/frame/frame/FrameConsole.o
[39800/50206] CXX obj/third_party/WebKit/Source/core/frame/frame/Location.o
[39801/50206] CXX obj/third_party/WebKit/Source/core/frame/frame/DOMWindowTimers.o
[39802/50206] CXX obj/third_party/WebKit/Source/core/frame/frame/ImageBitmap.o
[39803/50206] CXX obj/third_party/WebKit/Source/core/frame/frame/DeviceSingleWindowEventController.o
[39804/50206] CXX obj/third_party/WebKit/Source/core/frame/frame/Deprecation.o
[39805/50206] CXX obj/third_party/WebKit/Source/core/frame/frame/HostsUsingFeatures.o
[39806/50206] CXX obj/third_party/WebKit/Source/core/frame/frame/FrameViewAutoSizeInfo.o
[39807/50206] CXX obj/third_party/WebKit/Source/core/frame/frame/FrameSerializer.o
[39808/50206] CXX obj/third_party/WebKit/Source/core/frame/frame/EventHandlerRegistry.o
[39809/50206] CXX obj/third_party/WebKit/Source/core/frame/frame/RemoteFrameView.o
[39810/50206] CXX obj/third_party/WebKit/Source/core/frame/frame/History.o
[39811/50206] CXX obj/third_party/WebKit/Source/core/frame/frame/BrowserControls.o
[39812/50206] CXX obj/third_party/WebKit/Source/core/frame/frame/DOMVisualViewport.o
[39813/50206] CXX obj/third_party/WebKit/Source/core/frame/frame/FrameHost.o
[39814/50206] CXX obj/third_party/WebKit/Source/core/fileapi/fileapi/FileReader.o
[39815/50206] CXX obj/third_party/WebKit/Source/core/frame/frame/DOMWindow.o
[39816/50206] CXX obj/third_party/WebKit/Source/core/frame/frame/DOMTimer.o
[39817/50206] CXX obj/third_party/WebKit/Source/core/frame/frame/Frame.o
[39818/50206] CXX obj/third_party/WebKit/Source/core/frame/frame/LocalDOMWindow.o
[39819/50206] CXX obj/third_party/WebKit/Source/core/frame/frame/LocalFrame.o
[39820/50206] CXX obj/third_party/WebKit/Source/core/frame/frame/FrameView.o
ninja: build stopped: subcommand failed.
step returned non-zero exit code: 1
@@@STEP_FAILURE@@@

Suspecting below change could be a possible culprit:

https://chromium.googlesource.com/chromium/src/+/c0ff4c0d40a8b9ab8ed809a446aa298450c23462

@pfeldman: Kindly look into it. Please help us to find an owner of not with respect to your change.

Thanks.!