Merge 157903 - Turn off animations for page actions and browser actions.

Merge 157903 - Turn off animations for page actions and browser actions.

The icon observation code isn't set up to watch non-script-badges, so page
action animations wind up partially complete or cause a white background in
script badge mode.  A future refactoring to ExtensionAction should make
animations work for all types, but this fix is simple to fix the problem on the
Chrome 23 and maybe Chrome 22 branches.

BUG=141808, 144247, 144248
Review URL: https://chromiumcodereview.appspot.com/10967020

TBR=kareng
Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=159747