In this try job:
https://build.chromium.org/p/tryserver.chromium.linux/builders/linux_chromium_chromeos_compile_dbg_ng/builds/164044

from this CL:
https://codereview.chromium.org/1746403003/

there was this compile error:

[16451/31918] SOLINK lib/libwebcore_shared.so
FAILED: if [ ! -e lib/libwebcore_shared.so -o ! -e lib/libwebcore_shared.so.TOC ]; then /b/build/goma/gomacc ../../third_party/llvm-build/Release+Asserts/bin/clang++ -shared -Wl,-z,now -Wl,-z,relro -Wl,--fatal-warnings -Wl,-z,defs -pthread -Wl,-z,noexecstack -fPIC -fuse-ld=gold -B/b/build/slave/linux_chromeos/build/src/third_party/binutils/Linux_x64/Release/bin -Wl,--disable-new-dtags -L. -m64 -Wl,--icf=all -o lib/libwebcore_shared.so -Wl,-soname=libwebcore_shared.so @lib/libwebcore_shared.so.rsp && { readelf -d lib/libwebcore_shared.so | grep SONAME ; nm -gD -f p lib/libwebcore_shared.so | cut -f1-2 -d' '; } > lib/libwebcore_shared.so.TOC; else /b/build/goma/gomacc ../../third_party/llvm-build/Release+Asserts/bin/clang++ -shared -Wl,-z,now -Wl,-z,relro -Wl,--fatal-warnings -Wl,-z,defs -pthread -Wl,-z,noexecstack -fPIC -fuse-ld=gold -B/b/build/slave/linux_chromeos/build/src/third_party/binutils/Linux_x64/Release/bin -Wl,--disable-new-dtags -L. -m64 -Wl,--icf=all -o lib/libwebcore_shared.so -Wl,-soname=libwebcore_shared.so @lib/libwebcore_shared.so.rsp && { readelf -d lib/libwebcore_shared.so | grep SONAME ; nm -gD -f p lib/libwebcore_shared.so | cut -f1-2 -d' '; } > lib/libwebcore_shared.so.tmp && if ! cmp -s lib/libwebcore_shared.so.tmp lib/libwebcore_shared.so.TOC; then mv lib/libwebcore_shared.so.tmp lib/libwebcore_shared.so.TOC ; fi; fi
clang: error: no such file or directory: 'obj/third_party/WebKit/Source/core/gen/blink/bindings/core/v8/webcore_shared.V8GeneratedCoreBindings06.o'
clang: error: no such file or directory: 'obj/third_party/WebKit/Source/core/gen/blink/bindings/core/v8/webcore_shared.V8GeneratedCoreBindings14.o'
clang: error: no such file or directory: 'obj/third_party/WebKit/Source/core/gen/blink/bindings/core/v8/webcore_shared.V8GeneratedCoreBindings15.o'
clang: error: no such file or directory: 'obj/third_party/WebKit/Source/core/gen/blink/core/webcore_shared.HTMLElementFactory.o'
clang: error: no such file or directory: 'obj/third_party/WebKit/Source/core/gen/blink/core/webcore_shared.HTMLElementLookupTrie.o'
clang: error: no such file or directory: 'obj/third_party/WebKit/Source/core/gen/blink/core/webcore_shared.InputTypeNames.o'
clang: error: no such file or directory: 'obj/third_party/WebKit/Source/core/gen/blink/core/webcore_shared.SVGNames.o'
clang: error: no such file or directory: 'obj/third_party/WebKit/Source/core/gen/blink/core/webcore_shared.MediaTypeNames.o'
clang: error: no such file or directory: 'obj/third_party/WebKit/Source/core/gen/blink/core/webcore_shared.HTMLMetaElement.o'
clang: error: no such file or directory: 'obj/third_party/WebKit/Source/core/gen/blink/core/webcore_shared.XPathGrammar.o'
clang: error: no such file or directory: 'obj/third_party/WebKit/Source/core/layout/webcore_shared.LayoutScrollbar.o'
clang: error: no such file or directory: 'obj/third_party/WebKit/Source/core/layout/webcore_shared.LayoutScrollbarTheme.o'
ninja: build stopped: subcommand failed.

There is no way my CL caused this.

There seem to be some similar failures on:
https://build.chromium.org/p/tryserver.chromium.linux/builders/linux_chromium_chromeos_compile_dbg_ng?numbuilds=200

Needs investigation. CC'ing sheriffs. I don't remember the appropriate label and there's no auto-completion for the sheriffs.