GetHelp manifest.json update for M34.

BUG=none
NOTRY=true

Review URL: https://codereview.chromium.org/145353008

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@247499 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 247499