Remove frame ID from DidCommitProvisionalLoad.

Also passes RenderFrameHosts to RendererDidNavigate and cleans up the
RenderFrameHost interface.

BUG=314791
TEST=No behavior change.
R=nasko@chromium.org

Review URL: https://codereview.chromium.org/182713005

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@254576 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 254576