Add a presubmit check so that no new unit tests in content/ are added to the unit_tests target
Add a presubmit check so that no new unit tests in content/ are added to the unit_tests target

They should all go to content_unittests now

BUG=90443
TEST=manual

Review URL: http://codereview.chromium.org/8728012

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@111925 0039d316-1c4b-4281-b951-d872f2087c98

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