Handle audio device changes on Windows.

media/audio/audio_parameters.h

Index: media/audio/audio_parameters.h
diff --git a/media/audio/audio_parameters.h b/media/audio/audio_parameters.h
index be904f49068e1f15fb95328c37a96b403dfc901b..05e368e7c312a9ee6ad4013a15d743bea44de280 100644
--- a/media/audio/audio_parameters.h
+++ b/media/audio/audio_parameters.h
@@ -26,12 +26,6 @@ struct MEDIA_EXPORT AudioInputBuffer {
 
 class MEDIA_EXPORT AudioParameters {
  public:
-  // Compare is useful when AudioParameters is used as a key in std::map.
-  class MEDIA_EXPORT Compare {
-   public:
-    bool operator()(const AudioParameters& a, const AudioParameters& b) const;
-  };
-
   enum Format {
     AUDIO_PCM_LINEAR = 0,     // PCM is 'raw' amplitude samples.
     AUDIO_PCM_LOW_LATENCY,    // Linear PCM, low latency requested.
@@ -85,6 +79,19 @@ class MEDIA_EXPORT AudioParameters {
                                   // |channel_layout|.
 };
 
+// Comparison is useful when AudioParameters is used with std structures.
+inline bool operator<(const AudioParameters& a, const AudioParameters& b) {
+  if (a.format() != b.format())
+    return a.format() < b.format();
+  if (a.channels() != b.channels())
+    return a.channels() < b.channels();
+  if (a.sample_rate() != b.sample_rate())
+    return a.sample_rate() < b.sample_rate();
+  if (a.bits_per_sample() != b.bits_per_sample())
+    return a.bits_per_sample() < b.bits_per_sample();
+  return a.frames_per_buffer() < b.frames_per_buffer();
+}
+
 }  // namespace media
 
 #endif  // MEDIA_AUDIO_AUDIO_PARAMETERS_H_