Move media/audio files into media namespace

media/audio/simple_sources_unittest.cc

Index: media/audio/simple_sources_unittest.cc
diff --git a/media/audio/simple_sources_unittest.cc b/media/audio/simple_sources_unittest.cc
index 384ed0b6dbd961fe4e0df24712099515a267df43..1e19fd8dd4516638075569240e4e65542d8f362b 100644
--- a/media/audio/simple_sources_unittest.cc
+++ b/media/audio/simple_sources_unittest.cc
@@ -11,6 +11,8 @@
 #include "media/audio/simple_sources.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
+namespace media {
+
 static void GenerateRandomData(char* buffer, uint32 len) {
   static bool called = false;
   if (!called) {
@@ -99,3 +101,5 @@ TEST(SimpleSources, SineWaveAudio16MonoTest) {
   EXPECT_TRUE(last_buffer[half_period + 2] > last_buffer[half_period + 3]);
   oas->Close();
 }
+
+}  // namespace media