Make DefaultDeleter for Video{De|En}codeAccelerator

media/cast/video_sender/external_video_encoder.cc

Index: media/cast/video_sender/external_video_encoder.cc
diff --git a/media/cast/video_sender/external_video_encoder.cc b/media/cast/video_sender/external_video_encoder.cc
index d2e306504f4357723c28228dfec74834c4cdb125..92a8d50b9a60e2984c4724e4092fadb3ad1de2ed 100644
--- a/media/cast/video_sender/external_video_encoder.cc
+++ b/media/cast/video_sender/external_video_encoder.cc
@@ -131,9 +131,7 @@ class LocalVideoEncodeAcceleratorClient
     DCHECK(encoder_task_runner_);
     DCHECK(encoder_task_runner_->RunsTasksOnCurrentThread());
 
-    if (video_encode_accelerator_) {
-      video_encode_accelerator_.release()->Destroy();
-    }
+    video_encode_accelerator_.reset();
   }
 
   void SetBitRate(uint32 bit_rate) {
@@ -165,9 +163,7 @@ class LocalVideoEncodeAcceleratorClient
     DCHECK(encoder_task_runner_->RunsTasksOnCurrentThread());
     VLOG(1) << "ExternalVideoEncoder NotifyError: " << error;
 
-    if (video_encode_accelerator_) {
-      video_encode_accelerator_.release()->Destroy();
-    }
+    video_encode_accelerator_.reset();
     cast_environment_->PostTask(
         CastEnvironment::MAIN,
         FROM_HERE,