GTK: Calling chrome.browserAction.setIcon shouldn't hide tooltips.
GTK: Calling chrome.browserAction.setIcon shouldn't hide tooltips.

Previously, when a browser action's icon changes, it caused the gtk widget
tree to be modified, which hid all tooltips. This was a problem because
several popular extensions called setIcon on a timer of a few seconds.

BUG=37489
TEST=none

Review URL: http://codereview.chromium.org/1547036

git-svn-id: http://src.chromium.org/svn/trunk/src@44940 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: 9426cd4f36306b3ebaf130996902eefd176b2b44
meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser