UserAgent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_11_4) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/49.0.2623.75 Safari/537.36

Steps to reproduce the problem:
1. Build chromium 50.0.2661.75 from source
2. 
3. 

What is the expected behavior?
Build Succeed

What went wrong?
[14775/21396] CXX obj\google_apis\gaia\google_apis.oauth2_token_service.obj
FAILED: ninja -t msvc -e environment.x86 -- "C:\Program Files (x86)\Microsoft Visual Studio 14.0\VC\bin\amd64_x86\cl.exe" /nologo /showIncludes /FC @obj\google_apis\gaia\google_apis.oauth2_token_service.obj.rsp /c ..\..\google_apis\gaia\oauth2_token_service.cc /Foobj\google_apis\gaia\google_apis.oauth2_token_service.obj /Fdobj\google_apis\google_apis.cc.pdb
c:\users\dave\src\chromium\src\google_apis\gaia\oauth2_token_service.cc(316): error C2220: warning treated as error - no 'object' file generated
c:\users\dave\src\chromium\src\google_apis\gaia\oauth2_token_service.cc(316): warning C4334: '<<': result of 32-bit shift implicitly converted to 64 bits (was 64-bit shift intended?)
[14775/21396] CXX obj\media\cast\sender\cast_sender.video_encoder.obj
ninja: build stopped: subcommand failed.

Did this work before? Yes 49.0.2623.75

Chrome version: 50.0.2661.75  Channel: stable
OS Version: Windows 10
Flash Version: Shockwave Flash 20.0 r0