Fix the memory leak in the RequestFileSystemDialogTest reported by the Chrome OS ASAN builder.

chrome/browser/ui/views/extensions/request_file_system_dialog_view.cc

 // Copyright 2015 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/browser/ui/views/extensions/request_file_system_dialog_view.h"
 
 #include <stddef.h>
 
 #include <cstdlib>
 
@@ skipping 76 matching lines @@
 
 gfx::Insets RequestFileSystemDialogView::GetInsets() const {
   return ChromeLayoutProvider::Get()->GetInsetsMetric(views::INSETS_PANEL);
 }
 
 RequestFileSystemDialogView::RequestFileSystemDialogView(
     const std::string& extension_name,
     const std::string& volume_label,
     bool writable,
     const base::Callback<void(ui::DialogButton)>& callback)
-    : callback_(callback), contents_view_(new views::View) {
+    : callback_(callback) {
   DCHECK(!callback_.is_null());
 
   const base::string16 app_name = base::UTF8ToUTF16(extension_name);
   // TODO(mtomasz): Improve the dialog contents, so it's easier for the user
   // to understand what device is being requested.
   const base::string16 volume_name = base::UTF8ToUTF16(volume_label);
 
   std::vector<size_t> placeholder_offsets;
   const base::string16 message = l10n_util::GetStringFUTF16(
       writable ? IDS_FILE_SYSTEM_REQUEST_FILE_SYSTEM_DIALOG_WRITABLE_MESSAGE
@@ skipping 10 matching lines @@
                        bold_style);
   label->AddStyleRange(
       gfx::Range(placeholder_offsets[1],
                  placeholder_offsets[1] + volume_name.length()),
       bold_style);
 
   SetLayoutManager(new views::FillLayout());
 
   AddChildView(label);
 }