Remove obsolete TODO from RenderViewHostImpl

Navigation related IPCs will soon be moved to Navigator.

BUG=140752
R=creis@chromium.org

Review URL: https://codereview.chromium.org/85683003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@239469 0039d316-1c4b-4281-b951-d872f2087c98
SyncFS v2: Return authentication error message when token is not available and had drive error

BUG=240165
TEST=manual

Review URL: https://codereview.chromium.org/99883006

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@239470 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 239470