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.h

Index: content/common/fileapi/file_system_dispatcher.h
===================================================================
--- content/common/fileapi/file_system_dispatcher.h	(revision 163290)
+++ content/common/fileapi/file_system_dispatcher.h	(working copy)
@@ -24,6 +24,8 @@
 class FilePath;
 class GURL;
 
+namespace content {
+
 // Dispatches and sends file system related messages sent to/from a child
 // process from/to the main browser process.  There is one instance
 // per child process.  Messages are dispatched on the main child thread.
@@ -116,4 +118,6 @@
   DISALLOW_COPY_AND_ASSIGN(FileSystemDispatcher);
 };
 
+}  // namespace content
+
 #endif  // CONTENT_COMMON_FILEAPI_FILE_SYSTEM_DISPATCHER_H_