Refactor UpgradeDetector.
- Move peroidically timer based detection code into UpgradeDetectorImpl
for use on non-ChromeOS platform;
- Implement ChromeOS upgrade detection via UpdateLibrary observer and
apply a slightly different advisory timing for showing the badges
(show green arrow immediately on upgrade detected, then 2, 4, 7 days
for yellow, red and orange color);
BUG=chromium-os:16146
TEST=Verify fix for chromium-os:16146.
Review URL: http://codereview.chromium.org/7046096
git-svn-id: svn://svn.chromium.org/chrome/trunk/src@88800 0039d316-1c4b-4281-b951-d872f2087c98
7 files changed
