Cast: Removed unnecessary ref counters.

media/cast/video_sender/video_encoder.cc

Index: media/cast/video_sender/video_encoder.cc
diff --git a/media/cast/video_sender/video_encoder.cc b/media/cast/video_sender/video_encoder.cc
index 42d1a88cc2c590b488508169194ac847ec90c75e..c26f04afd6836f3bdf48426ea9b8b16f427d597c 100644
--- a/media/cast/video_sender/video_encoder.cc
+++ b/media/cast/video_sender/video_encoder.cc
@@ -6,6 +6,7 @@
 
 #include "base/bind.h"
 #include "base/logging.h"
+#include "base/message_loop/message_loop.h"
 
 namespace media {
 namespace cast {
@@ -16,7 +17,8 @@ VideoEncoder::VideoEncoder(scoped_refptr<CastEnvironment> cast_environment,
     : video_config_(video_config),
       cast_environment_(cast_environment),
       skip_next_frame_(false),
-      skip_count_(0) {
+      skip_count_(0),
+      weak_factory_(this) {
   if (video_config.codec == kVp8) {
     vp8_encoder_.reset(new Vp8Encoder(video_config, max_unacked_frames));
   } else {
@@ -35,6 +37,7 @@ bool VideoEncoder::EncodeVideoFrame(
     const base::TimeTicks& capture_time,
     const FrameEncodedCallback& frame_encoded_callback,
     const base::Closure frame_release_callback) {
+  DCHECK(cast_environment_->CurrentlyOn(CastEnvironment::MAIN));
   if (video_config_.codec != kVp8) return false;
 
   if (skip_next_frame_) {
@@ -44,9 +47,9 @@ bool VideoEncoder::EncodeVideoFrame(
   }
 
   cast_environment_->PostTask(CastEnvironment::VIDEO_ENCODER, FROM_HERE,
-      base::Bind(&VideoEncoder::EncodeVideoFrameEncoderThread, this,
-          video_frame, capture_time, dynamic_config_, frame_encoded_callback,
-          frame_release_callback));
+      base::Bind(&VideoEncoder::EncodeVideoFrameEncoderThread,
+          weak_factory_.GetWeakPtr(), video_frame, capture_time,
+          dynamic_config_, frame_encoded_callback, frame_release_callback));
 
   dynamic_config_.key_frame_requested = false;
   return true;