Fix flake in ProxyFactoryTest.CreateDifferentProfiles due to data race.
Fix flake in ProxyFactoryTest.CreateDifferentProfiles due to data race.

Google Mock isn't threadsafe on Windows!

BUG=122929
TEST=chrome_frame_tests.exe --gtest_filter=ProxyFactoryTest.CreateDifferentProfiles won't flake

Review URL: https://chromiumcodereview.appspot.com/10050014

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@131768 0039d316-1c4b-4281-b951-d872f2087c98

adobe/chromium,ropik/chromium,adobe/chromium,adobe/chromium,yitian134/chromium,ropik/chromium,adobe/chromium,adobe/chromium,yitian134/chromium,ropik/chromium,ropik/chromium,yitian134/chromium,yitian134/chromium,adobe/chromium,yitian134/chromium,ropik/chromium,yitian134/chromium,ropik/chromium,ropik/chromium,yitian134/chromium,yitian134/chromium,adobe/chromium,yitian134/chromium,adobe/chromium,ropik/chromium,ropik/chromium,adobe/chromium,yitian134/chromium,adobe/chromium,adobe/chromium