Build third-party code with -Wall, build chromium_code with -Wextra on Linux

chrome/browser/android/offline_pages/offline_page_utils.h

 // 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.
 
 #ifndef CHROME_BROWSER_ANDROID_OFFLINE_PAGES_OFFLINE_PAGE_UTILS_H_
 #define CHROME_BROWSER_ANDROID_OFFLINE_PAGES_OFFLINE_PAGE_UTILS_H_
 
 #include <stdint.h>
 
 class GURL;
@@ skipping 28 matching lines @@
   // Checks whether |offline_url| points to an offline page.
   static bool IsOfflinePage(content::BrowserContext* browser_context,
                             const GURL& offline_url);
 
   // Checks whether offline page for |online_url| exists.
   static bool HasOfflinePageForOnlineURL(
       content::BrowserContext* browser_context,
       const GURL& online_url);
 
   // Checks whether any offline page is saved.
-  static const bool HasOfflinePages(content::BrowserContext* browser_context);
+  static bool HasOfflinePages(content::BrowserContext* browser_context);
 };
 
 }  // namespace offline_pages
 
 #endif  // CHROME_BROWSER_ANDROID_OFFLINE_PAGES_OFFLINE_PAGE_UTILS_H_