Replace media::Limits struct with media::limits namespace and update documentation.

media/base/audio_decoder_config.cc

 // Copyright (c) 2011 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/base/audio_decoder_config.h"
 
 #include "base/logging.h"
 #include "base/metrics/histogram.h"
 #include "media/base/limits.h"
 
@@ skipping 82 matching lines @@
     extra_data_.reset();
   }
 }
 
 AudioDecoderConfig::~AudioDecoderConfig() {}
 
 bool AudioDecoderConfig::IsValidConfig() const {
   return codec_ != kUnknownAudioCodec &&
       channel_layout_ != CHANNEL_LAYOUT_UNSUPPORTED &&
       bits_per_channel_ > 0 &&
-      bits_per_channel_ <= Limits::kMaxBitsPerSample &&
+      bits_per_channel_ <= limits::kMaxBitsPerSample &&
       samples_per_second_ > 0 &&
-      samples_per_second_ <= Limits::kMaxSampleRate;
+      samples_per_second_ <= limits::kMaxSampleRate;
 }
 
 AudioCodec AudioDecoderConfig::codec() const {
   return codec_;
 }
 
 int AudioDecoderConfig::bits_per_channel() const {
   return bits_per_channel_;
 }
 
 ChannelLayout AudioDecoderConfig::channel_layout() const {
   return channel_layout_;
 }
 
 int AudioDecoderConfig::samples_per_second() const {
   return samples_per_second_;
 }
 
 uint8* AudioDecoderConfig::extra_data() const {
   return extra_data_.get();
 }
 
 size_t AudioDecoderConfig::extra_data_size() const {
   return extra_data_size_;
 }
 
 }  // namespace media