failing compile base/allocator/allocator_shim.cc with clang-cl on windows.

https://build.chromium.org/p/chromium.fyi/builders/CrWinClangGoma/builds/18232/steps/compile/logs/stdio
FAILED: obj/base/allocator/unified_allocator_shim/allocator_shim.obj 
E:\b\c\cipd\goma/gomacc.exe ../../third_party/llvm-build/Release+Asserts/bin/clang-cl.exe /nologo /showIncludes /FC @obj/base/allocator/unified_allocator_shim/allocator_shim.obj.rsp /c ../../base/allocator/allocator_shim.cc /Foobj/base/allocator/unified_allocator_shim/allocator_shim.obj /Fd"obj/base/allocator/unified_allocator_shim_cc.pdb"
../../base/allocator/allocator_shim.cc(37,18):  error: unused variable 'g_new_handler_lock' [-Werror,-Wunused-variable]
subtle::Atomic32 g_new_handler_lock = 0;
                 ^
1 error generated.

https://chromium.googlesource.com/chromium/src/+/60292df5e4ed2fb3edd2c6efe32d6944ab059696
?