Convert base::MemoryMappedFile to use File instead of PlatformFile.

chrome/renderer/spellchecker/hunspell_engine.cc

 // 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.
 
 #include "chrome/renderer/spellchecker/hunspell_engine.h"
 
 #include <algorithm>
 #include <iterator>
 
 #include "base/files/memory_mapped_file.h"
@@ skipping 43 matching lines @@
   file_ = file;
   // Delay the actual initialization of hunspell until it is needed.
 }
 
 void HunspellEngine::InitializeHunspell() {
   if (hunspell_.get())
     return;
 
   bdict_file_.reset(new base::MemoryMappedFile);
 
-  if (bdict_file_->Initialize(file_)) {
+  // TODO(rvargas): This object should not keep file_ after passing it to
+  // bdict_file_.
+  if (bdict_file_->Initialize(base::File(file_))) {
     TimeTicks debug_start_time = base::Histogram::DebugNow();
 
     hunspell_.reset(
         new Hunspell(bdict_file_->data(), bdict_file_->length()));
 
     DHISTOGRAM_TIMES("Spellcheck.InitTime",
                      base::Histogram::DebugNow() - debug_start_time);
   } else {
     NOTREACHED() << "Could not mmap spellchecker dictionary.";
   }
@@ skipping 59 matching lines @@
   // Don't initialize if hunspell is disabled.
   if (file_ != base::kInvalidPlatformFileValue)
     InitializeHunspell();
 
   return !initialized_;
 }
 
 bool HunspellEngine::IsEnabled() {
   return file_ != base::kInvalidPlatformFileValue;
 }