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

base/files/file.cc

 // Copyright (c) 2011 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/files/file.h"
 
 // TODO(rvargas): remove this (needed for kInvalidPlatformFileValue).
 #include "base/platform_file.h"
 
 namespace base {
@@ skipping 13 matching lines @@
       created_(false),
       async_(false) {
 }
 
 #if !defined(OS_NACL)
 File::File(const FilePath& name, uint32 flags)
     : file_(kInvalidPlatformFileValue),
       error_(FILE_OK),
       created_(false),
       async_(false) {
-  if (name.ReferencesParent()) {
-    error_ = FILE_ERROR_ACCESS_DENIED;
-    return;
-  }
-  CreateBaseFileUnsafe(name, flags);
+  Initialize(name, flags);
 }
 #endif
 
+File::File(PlatformFile platform_file)
+    : file_(platform_file),
+      error_(FILE_OK),
+      created_(false),
+      async_(false) {
+}
+
 File::File(RValue other)
     : file_(other.object->TakePlatformFile()),
       error_(other.object->error()),
       created_(other.object->created()),
       async_(other.object->async_) {
 }
 
 File::~File() {
   Close();
 }
 
 File& File::operator=(RValue other) {
   if (this != other.object) {
     Close();
     SetPlatformFile(other.object->TakePlatformFile());
     error_ = other.object->error();
     created_ = other.object->created();
     async_ = other.object->async_;
   }
   return *this;
 }
 
+#if !defined(OS_NACL)
+void File::Initialize(const FilePath& name, uint32 flags) {
+  if (name.ReferencesParent()) {
+    error_ = FILE_ERROR_ACCESS_DENIED;
+    return;
+  }
+  InitializeUnsafe(name, flags);
+}
+#endif
+
 }  // namespace base