Revert 226284 "Move TransferNavigationResourceThrottle into Cros..."

Memory errors in TransferNavigation unit tests.

> Move TransferNavigationResourceThrottle into CrossSiteResourceHandler.
> 
> We now transfer requests to a new process when they are ready to commit, rather than each time a redirect occurs.  This simplifies the ResourceDispatcherHost logic, and it prepares for a future CL to intercept all navigations in the browser process.
> 
> BUG=238331
> TEST=No more than one process swap for repeated redirects.
> 
> Review URL: https://codereview.chromium.org/15476003

TBR=creis@chromium.org

Review URL: https://codereview.chromium.org/25372005

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@226293 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 226293