Add content/browser/loader/ for resource loading related classes.

This infrastructure is shared by both renderer and worker processes, so having
it live in renderer_host/ was not quite right.  This change also nicely reduces
the number of files in renderer_host/.

[email protected]
Review URL: https://codereview.chromium.org/11414299

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@171194 0039d316-1c4b-4281-b951-d872f2087c98
62 files changed