Move media/audio files into media namespace

media/audio/audio_input_unittest.cc

Index: media/audio/audio_input_unittest.cc
diff --git a/media/audio/audio_input_unittest.cc b/media/audio/audio_input_unittest.cc
index 74effdad41fe82dbf5aecd61219c925bf7dfd952..56a4f718b97b1df2202563129e7a8ba70fdeecc5 100644
--- a/media/audio/audio_input_unittest.cc
+++ b/media/audio/audio_input_unittest.cc
@@ -11,6 +11,8 @@
 #include "media/audio/audio_manager_base.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
+namespace media {
+
 static const int kSamplingRate = 8000;
 static const int kSamplesPerPacket = kSamplingRate / 20;
 
@@ -170,3 +172,5 @@ TEST(AudioInputTest, Record) {
   ais->Stop();
   ais->Close();
 }
+
+}  // namespace media