Convert FileRefImpl and URLRequestInfo to shared_impl.

One nice side effect of this change is that there are no longer any IPCs
associated with the request info. Instead, we just send the parameters to
the host when we open a url loader.

Review URL: http://codereview.chromium.org/7706021

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@98391 0039d316-1c4b-4281-b951-d872f2087c98
49 files changed