Add presubmit check to catch use of PRODUCT_NAME in resources.

We should not be adding any new strings resources that use a PRODUCT_NAME
placeholder, because it is difficult to localize in some languages. Add a
presubmit check which shows a warning whenever a line is that contains
PRODUCT_NAME is changed in a .grd file.

BUG=None

Review URL: https://codereview.chromium.org/32213002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@230148 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 230148