Only send extension unloaded/loaded notifications when changing the incognito enabled flag.
Only send extension unloaded/loaded notifications when changing the incognito enabled flag.

BUG=75267
TEST=ExtensionToolbarModelTest.*

Review URL: http://codereview.chromium.org/6627078

git-svn-id: http://src.chromium.org/svn/trunk/src@77457 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: d2835fe7bf3ab3a412a18bbc6e36cbb26e10f21e
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