Update DEPS to point to git mirror of gtest and gmock

R=binji@chromium.org

Review URL: https://codereview.chromium.org/952723002

git-svn-id: https://nativeclient-sdk.googlecode.com/svn/trunk/src@1579 050acbb0-2703-11df-ab0a-9f3f633ae91d
1 file changed