Move a bunch of code in content\common (as well as a few left in renderer) to the content namespace.

content/common/net/url_request_user_data.h

Index: content/common/net/url_request_user_data.h
===================================================================
--- content/common/net/url_request_user_data.h	(revision 163290)
+++ content/common/net/url_request_user_data.h	(working copy)
@@ -7,6 +7,8 @@
 
 #include "base/supports_user_data.h"
 
+namespace content {
+
 // Used to annotate all URLRequests for which the request can be associated
 // with a given render view.
 class URLRequestUserData : public base::SupportsUserData::Data {
@@ -24,4 +26,6 @@
   int render_view_id_;
 };
 
+}  // namespace content
+
 #endif  // CONTENT_COMMON_NET_URL_REQUEST_USER_DATA_H_