[Mac] Make ExtensionInstalledBubbleController is-a BaseBubbleController.

[Mac] Make ExtensionInstalledBubbleController is-a BaseBubbleController.

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.

Committed: http://src.chromium.org/viewvc/chrome?view=rev&revision=126919

[Robert Sesek, 2012-03-14 23:50:34]

Sorry for the hairy XIB diffs.

[Nico, 2012-03-14 23:59:46]

LGTM

description needs a "xib changes" section

https://chromiumcodereview.appspot.com/9705038/diff/1/chrome/browser/ui/cocoa...
File chrome/browser/ui/cocoa/extensions/extension_installed_bubble_controller.mm
(right):

https://chromiumcodereview.appspot.com/9705038/diff/1/chrome/browser/ui/cocoa...
chrome/browser/ui/cocoa/extensions/extension_installed_bubble_controller.mm:251:
self.anchorPoint =
bleh, property syntax for nontrivial setters :-/

[commit-bot: I haz the power, 2012-03-15 12:55:51]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/rsesek@chromium.org/9705038/1

[commit-bot: I haz the power, 2012-03-15 15:54:27]

Change committed as 126919