Add support for 64-bit Windows build: base and chrome/app

base/file_util_win.cc

 // Copyright (c) 2006-2008 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.
 
 #include "base/file_util.h"
 
 #include <windows.h>
 #include <propvarutil.h>
 #include <shellapi.h>
 #include <shlobj.h>
@@ skipping 787 matching lines @@
 }
 
 bool MemoryMappedFile::MapFileToMemoryInternal() {
   if (file_ == INVALID_HANDLE_VALUE)
     return false;
 
   length_ = ::GetFileSize(file_, NULL);
   if (length_ == INVALID_FILE_SIZE)
     return false;
 
+  // length_ value comes from GetFileSize() above. GetFileSize() returns DWORD,
+  // therefore the cast here is safe.
   file_mapping_ = ::CreateFileMapping(file_, NULL, PAGE_READONLY,
-                                      0, length_, NULL);
+                                      0, static_cast<DWORD>(length_), NULL);
   if (file_mapping_ == INVALID_HANDLE_VALUE)
     return false;
 
   data_ = static_cast<uint8*>(
       ::MapViewOfFile(file_mapping_, FILE_MAP_READ, 0, 0, length_));
   return data_ != NULL;
 }
 
 void MemoryMappedFile::CloseHandles() {
   if (data_)
     ::UnmapViewOfFile(data_);
   if (file_mapping_ != INVALID_HANDLE_VALUE)
     ::CloseHandle(file_mapping_);
   if (file_ != INVALID_HANDLE_VALUE)
     ::CloseHandle(file_);
 
   data_ = NULL;
   file_mapping_ = file_ = INVALID_HANDLE_VALUE;
   length_ = INVALID_FILE_SIZE;
 }
 
 bool HasFileBeenModifiedSince(const FileEnumerator::FindInfo& find_info,
                               const base::Time& cutoff_time) {
   long result = CompareFileTime(&find_info.ftLastWriteTime,
                                 &cutoff_time.ToFileTime());
   return result == 1 || result == 0;
 }
 
 }  // namespace file_util