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

content/common/fileapi/file_system_dispatcher.cc

Index: content/common/fileapi/file_system_dispatcher.cc
===================================================================
--- content/common/fileapi/file_system_dispatcher.cc	(revision 163290)
+++ content/common/fileapi/file_system_dispatcher.cc	(working copy)
@@ -9,6 +9,8 @@
 #include "content/common/child_thread.h"
 #include "content/common/fileapi/file_system_messages.h"
 
+namespace content {
+
 FileSystemDispatcher::FileSystemDispatcher() {
 }
 
@@ -329,3 +331,5 @@
   dispatcher->DidOpenFile(IPC::PlatformFileForTransitToPlatformFile(file));
   dispatchers_.Remove(request_id);
 }
+
+}  // namespace content