GitLab

XIB changes:
* Change ExtensionInstalledBubbleController to have BaseBubbleController as a 
  parent class.
* Set the bubble_ outlet on the new base class and delete infoBubbleView_.

BUG=36366
TEST=Install an extension with a browser action. Bubble appears at browser action and behaves as before.
TEST=Install bundled extensions and make sure the bubble appears at the wrench menu.
TEST=Install an omnibox keyword extension and bubble appears at the lock icon.

Review URL: http://codereview.chromium.org/9705038

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@126919 0039d316-1c4b-4281-b951-d872f2087c98