[Mac] Page action icons were not being properly marked as needing to be redrawn when they were updated.
[Mac] Page action icons were not being properly marked as needing to be redrawn when they were updated.

BUG=none
TEST=Install any page action that changes its icon based on clicking something in the popup (FlashBlock) and make sure that the icon updates without having to click within the location bar or change windows.
Review URL: http://codereview.chromium.org/561035

git-svn-id: dd90618784b6a4b323ea0c23a071cb1c9e6f2ac7@37919 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser