This change updates gMock to the new release, 1.7.0. This is
necessary for Android, as Android Master has updated their gTest to
1.7.0, and we must always use the matching version of gMock.
This CL cleans up some removed files that were missed in the
previous commit.
Change-Id: I67ab17425aea8d44fff765f79737b6eb23d16b52