Revert 227731 "Add unit test for google_apis::RequestSender."

ASAN and valgrind bots are broken by this CL.

> Add unit test for google_apis::RequestSender.
> 
> BUG=161207, 251104
> 
> Review URL: https://codereview.chromium.org/26617003

TBR=kinaba@chromium.org

Review URL: https://codereview.chromium.org/26311003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@227738 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 227738