First failure: http://build.chromium.org/p/chromium.webrtc.fyi/builders/Win%20Builder/builds/8772

Caused by a Chromium breakage, likely https://codereview.chromium.org/2653713004

Log snippet:
[1189/1927] CXX obj/ui/views/mus/views_mus_tests_catalog_source/views_mus_tests_catalog_source.obj
FAILED: obj/ui/views/mus/views_mus_tests_catalog_source/views_mus_tests_catalog_source.obj 
ninja -t msvc -e environment.x86 -- E:\b\c\cipd\goma/gomacc.exe "E:\b\depot_tools\win_toolchain\vs_files\d3cb0e37bdd120ad0ac4650b674b09e81be45616\VC\bin\amd64_x86/cl.exe" /nologo /showIncludes /FC @obj/ui/views/mus/views_mus_tests_catalog_source/views_mus_tests_catalog_source.obj.rsp /c gen/ui/views/mus/views_mus_tests_catalog_source.cc /Foobj/ui/views/mus/views_mus_tests_catalog_source/views_mus_tests_catalog_source.obj /Fd"obj/ui/views/mus/views_mus_tests_catalog_source_cc.pdb"
e:\b\c\b\win_builder\src\out\release\gen\ui\views\mus\views_mus_tests_catalog_source.cc(575): error C2026: string too big, trailing characters truncated

I'm not sure why it only hits us. I don't see anything special with our config except we set symbol_level=1 but that means minimal symbols and I think it's the default on Windows: https://cs.chromium.org/chromium/src/build/config/compiler/compiler.gni?rcl=0&l=101

I fired a clobber build in https://uberchromegw.corp.google.com/i/chromium.webrtc.fyi/builders/Win%20Builder/builds/8789 to see if it helped but it got the same error.

The Win Builder in https://build.chromium.org/p/chromium.webrtc/waterfall is still green though.