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TaskRunner just has Post{,Delayed}Task(), SequencedTaskRunner
extends Executor to have ordering guarantees and PostNonNestable{,Delayed}Task(), and SingleThreadTaskRunner extends SequencedTaskRunner and guarantees execution on a single thread.
Move a bunch of methods from MessageLoopProxy into the TaskRunner classes and make it inherit from SingleThreadTaskRunner.
BUG=110973
TEST=
Review URL: https://chromiumcodereview.appspot.com/9169037
git-svn-id: svn://svn.chromium.org/chrome/trunk/src@121999 0039d316-1c4b-4281-b951-d872f2087c98
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