Fix memory usage bug.

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 552 matching lines @@
   playback_rate = std::max(playback_rate, 1.0);
   playback_rate = std::min(playback_rate, kMaxPlaybackRate);
 
   int64_t bytes_per_second = (bitrate / 8.0) * playback_rate;
 
   int64_t preload = clamp(kTargetSecondsBufferedAhead * bytes_per_second,
                           kMinBufferPreload, kMaxBufferPreload);
   int64_t back_buffer = clamp(kTargetSecondsBufferedBehind * bytes_per_second,
                               kMinBufferPreload, kMaxBufferPreload);
   int64_t pin_forwards = kMaxBufferSize - back_buffer;
-  DCHECK_LE(preload_ + kPreloadHighExtra, pin_forwards);
-  reader_->SetMaxBuffer(back_buffer, pin_forwards);
+  DCHECK_LE(preload + kPreloadHighExtra, pin_forwards);
+  reader_->SetMaxBuffer(back_buffer, preload + kPreloadHighExtra);
 
   if (preload_ == METADATA) {
     reader_->SetPreload(0, 0);
   } else {
     reader_->SetPreload(preload + kPreloadHighExtra, preload);
   }
 }
 
 }  // namespace media