GitLab

This is step 2 of 5 in moving HistoryController to content/, as described in http://crbug.com/357327

These calls will allow content/ to be responsible for updating history state in step 3, and eventually to implement history state management in step 4.

BUG=357327

Review URL: https://codereview.chromium.org/218993014

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@261458 0039d316-1c4b-4281-b951-d872f2087c98