Doc revamp: Updated document titles to match titles in new sidenav.

STAGED DOCS: http://ypd-ubiq182.dls.corp.google.com:8000/apps/api_index.html

R=kalman@chromium.org

Review URL: https://codereview.chromium.org/31633002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@230061 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 230061