Remove obviously unneeded forward declarations from headers under src/{app,base,net}.

base/file_version_info_win.h

-// Copyright (c) 2006-2008 The Chromium Authors. All rights reserved.
+// Copyright (c) 2010 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 BASE_FILE_VERSION_INFO_WIN_H_
 #define BASE_FILE_VERSION_INFO_WIN_H_
 #pragma once
 
 #include <string>
 
 #include "base/basictypes.h"
 #include "base/file_version_info.h"
 #include "base/scoped_ptr.h"
 
 struct tagVS_FIXEDFILEINFO;
 typedef tagVS_FIXEDFILEINFO VS_FIXEDFILEINFO;
 
-class FilePath;
-
 // Provides a way to access the version information for a file.
 // This is the information you access when you select a file in the Windows
 // explorer, right-click select Properties, then click the Version tab.
 
 class FileVersionInfoWin : public FileVersionInfo {
  public:
   FileVersionInfoWin(void* data, int language, int code_page);
   ~FileVersionInfoWin();
 
   // Accessors to the different version properties.
@@ skipping 29 matching lines @@
   scoped_ptr_malloc<char> data_;
   int language_;
   int code_page_;
   // This is a pointer into the data_ if it exists. Otherwise NULL.
   VS_FIXEDFILEINFO* fixed_file_info_;
 
   DISALLOW_COPY_AND_ASSIGN(FileVersionInfoWin);
 };
 
 #endif  // BASE_FILE_VERSION_INFO_WIN_H_