on mac:

[20581/200/1521] CXX obj/third_party/...ontrols/MediaControlsResourceLoader.o
../../third_party/WebKit/Source/modules/media_controls/MediaControlsResourceLoader.cpp:59:24: warning: pragma diagnostic pop could not pop, no matching push [-Wunknown-pragmas]
#pragma GCC diagnostic pop
                       ^
1 warning generated.