GitLab

Turns out the refactoring in r158146 made us use the incorrect
WebContentsObserver callback.

BUG=https://code.google.com/p/android/issues/detail?id=62100, b/11656658 
TEST=AndroidWebViewTest

Review URL: https://codereview.chromium.org/68763012

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@235785 0039d316-1c4b-4281-b951-d872f2087c98