Move media library AutoTaskRunner to base and rename ScopedTaskRunner.

media/filters/decoder_base.h

Index: media/filters/decoder_base.h
diff --git a/media/filters/decoder_base.h b/media/filters/decoder_base.h
index a889e19fb1082de5d09b9c7062861b8d4d8efd91..dd28ec2926f4193ac689655a80f878dcd9dd360f 100644
--- a/media/filters/decoder_base.h
+++ b/media/filters/decoder_base.h
@@ -102,7 +102,8 @@ class DecoderBase : public Decoder {
   // be called from within the Filter::Stop() method prior to stopping the
   // base class.
   virtual void DoStop(Task* done_cb) {
-    AutoTaskRunner done_runner(done_cb);
+    done_cb->Run();

[dmac, 2011/05/26 17:55:42]

Maybe I'm being slow this morning, but why is this not a ScopedTaskRunnner now?

[Wez, 2011/05/26 18:48:21]

Reverted.

I was thinking of this as an unnecessary dependency; there's only one code-path
so |done_cb->Run(); delete done_cb;| seemed cleaner.  I'm not entirely sure why
this method has a default implementation at all, given that its peers don't.

+    delete done_cb;
   }
 
   // Derived class can implement this method and perform seeking logic prior