Make AudioParameters a class instead of a struct

media/base/channel_layout.h

Index: media/base/channel_layout.h
diff --git a/media/base/channel_layout.h b/media/base/channel_layout.h
index 7dd1ec8bf4faafc470a1a50b706f0f948a483f02..4603f9da37bf28150becc1e932fdd4f1e7b2239e 100644
--- a/media/base/channel_layout.h
+++ b/media/base/channel_layout.h
@@ -24,7 +24,7 @@ enum ChannelLayout {
   CHANNEL_LAYOUT_SURROUND,
 
   // Front L, Front R, Front C, Back C
-  CHANNEL_LAYOUT_4POINT0,
+  CHANNEL_LAYOUT_4_0,
 
   // Front L, Front R, Side L, Side R
   CHANNEL_LAYOUT_2_2,
@@ -33,25 +33,25 @@ enum ChannelLayout {
   CHANNEL_LAYOUT_QUAD,
 
   // Front L, Front R, Front C, Side L, Side R
-  CHANNEL_LAYOUT_5POINT0,
+  CHANNEL_LAYOUT_5_0,
 
   // Front L, Front R, Front C, Side L, Side R, LFE
-  CHANNEL_LAYOUT_5POINT1,
+  CHANNEL_LAYOUT_5_1,
 
   // Front L, Front R, Front C, Back L, Back R
-  CHANNEL_LAYOUT_5POINT0_BACK,
+  CHANNEL_LAYOUT_5_0_BACK,
 
   // Front L, Front R, Front C, Back L, Back R, LFE
-  CHANNEL_LAYOUT_5POINT1_BACK,
+  CHANNEL_LAYOUT_5_1_BACK,
 
   // Front L, Front R, Front C, Side L, Side R, Back L, Back R
-  CHANNEL_LAYOUT_7POINT0,
+  CHANNEL_LAYOUT_7_0,
 
   // Front L, Front R, Front C, Side L, Side R, LFE, Back L, Back R
-  CHANNEL_LAYOUT_7POINT1,
+  CHANNEL_LAYOUT_7_1,
 
   // Front L, Front R, Front C, Back L, Back R, LFE, Front LofC, Front RofC
-  CHANNEL_LAYOUT_7POINT1_WIDE,
+  CHANNEL_LAYOUT_7_1_WIDE,
 
   // Stereo L, Stereo R
   CHANNEL_LAYOUT_STEREO_DOWNMIX,