Remove redundant and erroneous DCHECK

media/blink/multibuffer_data_source.cc

 // Copyright 2013 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 "media/blink/multibuffer_data_source.h"
 
 #include <utility>
 
 #include "base/bind.h"
 #include "base/callback_helpers.h"
@@ skipping 248 matching lines @@
   // If init_cb is set, we initialization is not finished yet.
   if (!init_cb_.is_null())
     return false;
   if (failed_)
     return false;
   return true;
 }
 
 void MultibufferDataSource::MediaPlaybackRateChanged(double playback_rate) {
   DCHECK(render_task_runner_->BelongsToCurrentThread());
-  DCHECK(reader_.get());
 
   if (playback_rate < 0.0)
     return;
 
   playback_rate_ = playback_rate;
   cancel_on_defer_ = false;
   UpdateBufferSizes();
 }
 
 void MultibufferDataSource::MediaIsPlaying() {
@@ skipping 335 matching lines @@
   reader_->SetPinRange(back_buffer, kMaxBufferPreload + kPreloadHighExtra);
 
   if (preload_ == METADATA) {
     reader_->SetPreload(0, 0);
   } else {
     reader_->SetPreload(preload_high, preload);
   }
 }
 
 }  // namespace media