base: remove unused header and include the right one instead
base: remove unused header and include the right one instead

Don't include "base/gtest_prod_util.h". It defines one macro and that is not used here. Include the needed testing header in two places instead.

BUG=105855


Review URL: http://codereview.chromium.org/8555003

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@112209 0039d316-1c4b-4281-b951-d872f2087c98

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