Put the Pepper stuff in the content namespace.

content/renderer/pepper/pepper_device_enumeration_event_handler.h

Index: content/renderer/pepper/pepper_device_enumeration_event_handler.h
diff --git a/content/renderer/pepper/pepper_device_enumeration_event_handler.h b/content/renderer/pepper/pepper_device_enumeration_event_handler.h
index 3712b94d5a58113cd1baf9a77b9faeb0dd9ed985..e43a151530f95f9f69c78ac9d53c8d56b35c1a3b 100644
--- a/content/renderer/pepper/pepper_device_enumeration_event_handler.h
+++ b/content/renderer/pepper/pepper_device_enumeration_event_handler.h
@@ -12,6 +12,8 @@
 #include "content/renderer/pepper/pepper_plugin_delegate_impl.h"
 #include "webkit/plugins/ppapi/plugin_delegate.h"
 
+namespace content {
+
 class PepperDeviceEnumerationEventHandler
     : public MediaStreamDispatcherEventHandler,
       public base::SupportsWeakPtr<PepperDeviceEnumerationEventHandler> {
@@ -76,4 +78,6 @@ class PepperDeviceEnumerationEventHandler
   DISALLOW_COPY_AND_ASSIGN(PepperDeviceEnumerationEventHandler);
 };
 
+}  // namespace content
+
 #endif  // CONTENT_RENDERER_PEPPER_PEPPER_DEVICE_ENUMERATION_EVENT_HANDLER_H_