Convert NotificationPresenter to Chromium-style and remove HTML notification leftovers.

BUG=

Review URL: https://codereview.chromium.org/178403005

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@254182 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 254182