base: Move MemoryMappedFile out of file_util.h and into its own header file.

chrome_frame/test/test_server.h

Index: chrome_frame/test/test_server.h
diff --git a/chrome_frame/test/test_server.h b/chrome_frame/test/test_server.h
index 48fd4b7e85f4e96d4c36481a08efbef408c660b2..eb0f01e1afd68ee3127619baa9d1956709380f35 100644
--- a/chrome_frame/test/test_server.h
+++ b/chrome_frame/test/test_server.h
@@ -39,10 +39,13 @@
 #include <string>
 
 #include "base/basictypes.h"
-#include "base/file_util.h"
 #include "base/message_loop.h"
 #include "net/base/stream_listen_socket.h"
 
+namespace base {
+class MemoryMappedFile;
+}
+
 namespace test_server {
 
 class Request {
@@ -251,7 +254,7 @@ class FileResponse : public ResponseForPath {
 
  protected:
   base::FilePath file_path_;
-  mutable scoped_ptr<file_util::MemoryMappedFile> file_;
+  mutable scoped_ptr<base::MemoryMappedFile> file_;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(FileResponse);