Merge 75412 - Add product-specific flags to the rename command in the...

Merge 75412 - Add product-specific flags to the rename command in the registry.  This fixes a regression that prevented in-place upgrades of Chrome Frame from working.

BUG=73329
TEST=Follow the steps in the bug.  Between steps 4 and 5, check that the "cmd" registry value in HKLM\Software\Google\Update\Clients\{8BA986DA-5100-405E-AA35-86F34A02ACBF} contains "--chrome-frame".

Review URL: http://codereview.chromium.org/6541029

TBR=grt@chromium.org
Review URL: http://codereview.chromium.org/6469069

git-svn-id: svn://svn.chromium.org/chrome/branches/648/src@75502 0039d316-1c4b-4281-b951-d872f2087c98