Plumb file system name down from MediaFileSystemRegistry.

Using a good name requires some refactoring in the registry which I'll do in subsequent CLs.

BUG=NONE
TEST=NONE


Review URL: https://chromiumcodereview.appspot.com/10827057

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@149272 0039d316-1c4b-4281-b951-d872f2087c98
7 files changed