content: Cleanup class/struct forward declarations

content/browser/download/mock_download_file.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CONTENT_BROWSER_DOWNLOAD_MOCK_DOWNLOAD_FILE_H_
 #define CONTENT_BROWSER_DOWNLOAD_MOCK_DOWNLOAD_FILE_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <map>
 #include <string>
 
 #include "base/files/file_path.h"
 #include "base/memory/ref_counted.h"
 #include "content/browser/download/download_file.h"
 #include "content/public/browser/download_manager.h"
 #include "testing/gmock/include/gmock/gmock.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace content {
-struct DownloadCreateInfo;
 
 class MockDownloadFile : public DownloadFile {
  public:
   MockDownloadFile();
   virtual ~MockDownloadFile();
 
   // DownloadFile functions.
   MOCK_METHOD1(Initialize, void(const InitializeCallback&));
   MOCK_METHOD2(AppendDataToFile, DownloadInterruptReason(
       const char* data, size_t data_len));
@@ skipping 18 matching lines @@
   MOCK_METHOD1(GetHash, bool(std::string* hash));
   MOCK_METHOD0(SendUpdate, void());
   MOCK_CONST_METHOD0(Id, int());
   MOCK_METHOD0(GetDownloadManager, DownloadManager*());
   MOCK_CONST_METHOD0(DebugString, std::string());
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_DOWNLOAD_MOCK_DOWNLOAD_FILE_H_