Fixes for re-enabling more MSVC level 4 warnings: components/ edition

components/translate/core/browser/translate_ui_delegate.h

 // Copyright 2014 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 COMPONENTS_TRANSLATE_CORE_BROWSER_TRANSLATE_UI_DELEGATE_H_
 #define COMPONENTS_TRANSLATE_CORE_BROWSER_TRANSLATE_UI_DELEGATE_H_
 
 #include <string>
 #include <vector>
 
 #include "base/logging.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/memory/weak_ptr.h"
 #include "base/strings/string16.h"
 #include "components/translate/core/common/translate_errors.h"
 
 class LanguageState;
 class TranslateClient;
 class TranslateDriver;
 class TranslateManager;
 class TranslatePrefs;
 
 // The TranslateUIDelegate is a generic delegate for UI which offers Translate
 // feature to the user.
 class TranslateUIDelegate {
  public:
-  enum { NO_INDEX = -1, };
+  static const size_t kNoIndex = static_cast<size_t>(-1);
 
   TranslateUIDelegate(const base::WeakPtr<TranslateManager>& translate_manager,
                       const std::string& original_language,
                       const std::string& target_language);
   virtual ~TranslateUIDelegate();
 
   // Handles when an error message is shown.
   void OnErrorShown(TranslateErrors::Type error_type);
 
   // Returns the LanguageState associated with this object.
@@ skipping 84 matching lines @@
   // The index for language the page should be translated to.
   size_t target_language_index_;
 
   // The translation related preferences.
   scoped_ptr<TranslatePrefs> prefs_;
 
   DISALLOW_COPY_AND_ASSIGN(TranslateUIDelegate);
 };
 
 #endif  // COMPONENTS_TRANSLATE_CORE_BROWSER_TRANSLATE_UI_DELEGATE_H_