Update AomVideoDecoder::Reset() to new prototype.

The prototype of the pure virtual method VideoDecoder::Reset() changed
from
    virtual void Reset(const base::Closure& closure) = 0;
to
    virtual void Reset(base::OnceClosure closure) = 0;
in commit 7ee39c86. Update
AomVideoDecoder::Reset() to the new prototype.

Tested:
  $ gn args out/Default
  In the editor, add the following line:
  enable_libaom_decoder = true
  $ autoninja -C out/Default media_unittests
  $ out/Default/media_unittests

Change-Id: I1ccfe15588e6c94817f2d671bc55e9fea7305ae2
Bug: chromium:1055917
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2079851Reviewed-by: Dale Curtis <dalecurtis@chromium.org>
Commit-Queue: Wan-Teh Chang <wtc@google.com>
Cr-Commit-Position: refs/heads/master@{#745560}

media/filters/aom_video_decoder.cc

@@ -229,11 +229,12 @@ void AomVideoDecoder::Decode(scoped_refptr<DecoderBuffer> buffer,
   std::move(bound_decode_cb).Run(DecodeStatus::OK);
 }
 
-void AomVideoDecoder::Reset(const base::Closure& reset_cb) {
+void AomVideoDecoder::Reset(base::OnceClosure closure) {
   DCHECK_CALLED_ON_VALID_THREAD(thread_checker_);
   state_ = DecoderState::kNormal;
   timestamps_.clear();
-  base::SequencedTaskRunnerHandle::Get()->PostTask(FROM_HERE, reset_cb);
+  base::SequencedTaskRunnerHandle::Get()->PostTask(FROM_HERE,
+                                                   std::move(closure));
 }
 
 void AomVideoDecoder::CloseDecoder() {

media/filters/aom_video_decoder.h

@@ -35,7 +35,7 @@ class MEDIA_EXPORT AomVideoDecoder : public VideoDecoder {
                   const OutputCB& output_cb,
                   const WaitingCB& waiting_cb) override;
   void Decode(scoped_refptr<DecoderBuffer> buffer, DecodeCB decode_cb) override;
-  void Reset(const base::Closure& reset_cb) override;
+  void Reset(base::OnceClosure closure) override;
 
  private:
   enum class DecoderState {