switch to DVLOG from VLOG, and move struct definition to cc file

content/browser/renderer_host/media/media_stream_dispatcher_host.h

Index: content/browser/renderer_host/media/media_stream_dispatcher_host.h
===================================================================
--- content/browser/renderer_host/media/media_stream_dispatcher_host.h	(revision 109546)
+++ content/browser/renderer_host/media/media_stream_dispatcher_host.h	(working copy)
@@ -63,16 +63,7 @@
   const content::ResourceContext* resource_context_;
   int render_process_id_;
 
-  struct StreamRequest {
-    StreamRequest() {}
-    StreamRequest(int render_view_id, int page_request_id)
-        : render_view_id(render_view_id),
-          page_request_id(page_request_id ) {
-    }
-    int render_view_id;
-    // Id of the request generated by MediaStreamDispatcher.
-    int page_request_id;
-  };
+  struct StreamRequest;
   typedef std::map<std::string, StreamRequest> StreamMap;
   // Streams generated for this host.
   StreamMap streams_;