[SiteChip] Don't show bubble in response to location bar LocationIconView in experiment.

Also restricts experiment-on location bar icon to be the page icon.

R=msw@chromium.org
BUG=315944

Review URL: https://codereview.chromium.org/114723004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@240722 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 240722