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

content/common/appcache/appcache_backend_proxy.h

Index: content/common/appcache/appcache_backend_proxy.h
===================================================================
--- content/common/appcache/appcache_backend_proxy.h	(revision 163290)
+++ content/common/appcache/appcache_backend_proxy.h	(working copy)
@@ -8,6 +8,8 @@
 #include "ipc/ipc_sender.h"
 #include "webkit/appcache/appcache_interfaces.h"
 
+namespace content {
+
 // Sends appcache related messages to the main process.
 class AppCacheBackendProxy : public appcache::AppCacheBackend {
  public:
@@ -45,4 +47,6 @@
   IPC::Sender* sender_;
 };
 
+}  // namespace content
+
 #endif  // CONTENT_COMMON_APPCACHE_APPCACHE_BACKEND_PROXY_H_