[Cast] Clean-up: Move max_unacked_frames into CongestionControl.

media/cast/sender/video_encoder_impl_unittest.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include <vector>
 
 #include "base/bind.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
 #include "media/base/video_frame.h"
@@ skipping 90 matching lines @@
   }
 
   virtual void TearDown() override {
     video_encoder_.reset();
     task_runner_->RunTasks();
   }
 
   void CreateEncoder() {
     test_video_encoder_callback_ = new TestVideoEncoderCallback(
         video_config_.max_number_of_video_buffers_used != 1);
-    video_encoder_.reset(new VideoEncoderImpl(
-        cast_environment_, video_config_,
-        0 /* useless arg to be removed in later change */));
+    video_encoder_.reset(
+        new VideoEncoderImpl(cast_environment_, video_config_));
   }
 
   void AdvanceClockAndVideoFrameTimestamp() {
     testing_clock_->Advance(base::TimeDelta::FromMilliseconds(33));
     video_frame_->set_timestamp(
         video_frame_->timestamp() + base::TimeDelta::FromMilliseconds(33));
   }
 
   base::SimpleTestTickClock* testing_clock_;  // Owned by CastEnvironment.
   scoped_refptr<TestVideoEncoderCallback> test_video_encoder_callback_;
@@ skipping 85 matching lines @@
     EXPECT_TRUE(video_encoder_->EncodeVideoFrame(
         video_frame_, testing_clock_->NowTicks(), frame_encoded_callback));
     task_runner_->RunTasks();
   }
 
   EXPECT_EQ(10, test_video_encoder_callback_->count_frames_delivered());
 }
 
 }  // namespace cast
 }  // namespace media