Put the Pepper stuff in the content namespace.

content/renderer/pepper/pepper_platform_audio_output_impl.cc

Index: content/renderer/pepper/pepper_platform_audio_output_impl.cc
diff --git a/content/renderer/pepper/pepper_platform_audio_output_impl.cc b/content/renderer/pepper/pepper_platform_audio_output_impl.cc
index be636dc785fa8f712bf8631a1febd7fe723175fd..bbbd375521be690fc0282900d74bb85bcce2c825 100644
--- a/content/renderer/pepper/pepper_platform_audio_output_impl.cc
+++ b/content/renderer/pepper/pepper_platform_audio_output_impl.cc
@@ -13,6 +13,8 @@
 #include "content/renderer/media/audio_hardware.h"
 #include "content/renderer/render_thread_impl.h"
 
+namespace content {
+
 PepperPlatformAudioOutputImpl::PepperPlatformAudioOutputImpl()
     : client_(NULL),
       stream_id_(0),
@@ -161,3 +163,5 @@ void PepperPlatformAudioOutputImpl::OnStreamCreated(
                    handle, socket_handle, length));
   }
 }
+
+}  // namespace content