Fix GYP_DEFINES for goma Windows clang FYI bot.
Fix GYP_DEFINES for goma Windows clang FYI bot.

The FYI bot config used slightly different config from non-goma Windows
clang FYI bot.  I guess it made the FYI bot get stuck.

Let me update the config to follow what non-goma Windows clang FYI bot
does.

Review URL: https://codereview.chromium.org/658273002

git-svn-id: 239fca9b83025a0b6f823aeeca02ba5be3d9fd76@292506 0039d316-1c4b-4281-b951-d872f2087c98

eunchong/build,eunchong/build,eunchong/build,eunchong/build