Move media library AutoTaskRunner to base and rename ScopedTaskRunner.

This is needed to avoid faux dependencies on media/ creeping in to remoting/ code, and creating linker issues.

BUG=
TEST=Everything works as before.


Review URL: http://codereview.chromium.org/7062013

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@86971 0039d316-1c4b-4281-b951-d872f2087c98
17 files changed