Move ChannelLayout into media namespace.

media/base/audio_bus_unittest.cc

Index: media/base/audio_bus_unittest.cc
diff --git a/media/base/audio_bus_unittest.cc b/media/base/audio_bus_unittest.cc
index acc1907bfe1e0bc8c35d61275e8368144447fbd8..476c82ed155d399824d3b0ccaf1943a150f4c805 100644
--- a/media/base/audio_bus_unittest.cc
+++ b/media/base/audio_bus_unittest.cc
@@ -11,14 +11,14 @@
 #include "media/base/channel_layout.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
+namespace media {
+
 static const int kChannels = 6;
 static const ChannelLayout kChannelLayout = CHANNEL_LAYOUT_5_1;
 // Use a buffer size which is intentionally not a multiple of kChannelAlignment.
 static const int kFrameCount = media::AudioBus::kChannelAlignment * 32 - 1;
 static const int kSampleRate = 48000;
 
-namespace media {
-
 class AudioBusTest : public testing::Test {
  public:
   AudioBusTest() {}