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 on windows 10
2. 
3. 

What is the expected behavior?
Successfully build

What went wrong?
[5635/21396] RULE Assembling nacl_switch_unwind_win.asm to obj\na...rch\x86_64\service_runtime_x86_64.gen\nacl_switch_unwind_win.obj.
 Assembling: nacl_switch_unwind_win.asm
[5939/21396] CXX obj\sandbox\win\src\sandbox_win64.broker_services.obj
FAILED: ninja -t msvc -e environment.x64 -- "C:\Program Files (x86)\Microsoft Visual Studio 14.0\VC\bin\amd64\cl.exe" /nologo /showIncludes /FC @obj\sandbox\win\src\sandbox_win64.broker_services.obj.rsp /c ..\..\sandbox\win\src\broker_services.cc /Foobj\sandbox\win\src\sandbox_win64.broker_services.obj /Fdobj\sandbox\sandbox_win64.cc.pdb
c:\users\dave\src\chromium\src\sandbox\win\src\broker_services.cc(340): error C2065: 'PROCESS_CREATION_CHILD_PROCESS_RESTRICTED': undeclared identifier

Did this work before? Yes Chromium 49.0.2623.75

Chrome version: 50.0.2661.75  Channel: stable
OS Version: 10
Flash Version: Shockwave Flash 21.0.0.216