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

chrome_frame/test/test_server.cc

Index: chrome_frame/test/test_server.cc
diff --git a/chrome_frame/test/test_server.cc b/chrome_frame/test/test_server.cc
index cca7fe3b428ec16b518e49ac3196bb39311d841b..643b8ca50bc50f1075742dc07d92105bb230a203 100644
--- a/chrome_frame/test/test_server.cc
+++ b/chrome_frame/test/test_server.cc
@@ -2,6 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+#include "chrome_frame/test/test_server.h"
+
 #include <windows.h>
 #include <objbase.h>
 #include <urlmon.h>
@@ -14,7 +16,6 @@
 #include "base/stringprintf.h"
 #include "base/utf_string_conversions.h"
 #include "chrome_frame/test/chrome_frame_test_utils.h"
-#include "chrome_frame/test/test_server.h"
 #include "net/base/tcp_listen_socket.h"
 #include "net/base/winsock_init.h"
 #include "net/http/http_util.h"
@@ -117,7 +118,7 @@ void FileResponse::WriteContents(net::StreamListenSocket* socket) const {
 
 size_t FileResponse::ContentLength() const {
   if (file_.get() == NULL) {
-    file_.reset(new file_util::MemoryMappedFile());
+    file_.reset(new base::MemoryMappedFile());
     if (!file_->Initialize(file_path_)) {
       NOTREACHED();
       file_.reset();