Standardize usage of virtual/override/final specifiers.

extensions/shell/common/shell_extensions_client.cc

 // 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.
 
 #include "extensions/shell/common/shell_extensions_client.h"
 
 #include "base/lazy_instance.h"
 #include "base/logging.h"
 #include "extensions/common/api/generated_schemas.h"
 #include "extensions/common/common_manifest_handlers.h"
@@ skipping 20 matching lines @@
 template <class FeatureClass>
 SimpleFeature* CreateFeature() {
   return new FeatureClass;
 }
 
 // TODO(jamescook): Refactor ChromePermissionsMessageProvider so we can share
 // code. For now, this implementation does nothing.
 class ShellPermissionMessageProvider : public PermissionMessageProvider {
  public:
   ShellPermissionMessageProvider() {}
-  virtual ~ShellPermissionMessageProvider() {}
+  ~ShellPermissionMessageProvider() override {}
 
   // PermissionMessageProvider implementation.
-  virtual PermissionMessages GetPermissionMessages(
+  PermissionMessages GetPermissionMessages(
       const PermissionSet* permissions,
       Manifest::Type extension_type) const override {
     return PermissionMessages();
   }
 
-  virtual std::vector<base::string16> GetWarningMessages(
+  std::vector<base::string16> GetWarningMessages(
       const PermissionSet* permissions,
       Manifest::Type extension_type) const override {
     return std::vector<base::string16>();
   }
 
-  virtual std::vector<base::string16> GetWarningMessagesDetails(
+  std::vector<base::string16> GetWarningMessagesDetails(
       const PermissionSet* permissions,
       Manifest::Type extension_type) const override {
     return std::vector<base::string16>();
   }
 
-  virtual bool IsPrivilegeIncrease(
-      const PermissionSet* old_permissions,
-      const PermissionSet* new_permissions,
-      Manifest::Type extension_type) const override {
+  bool IsPrivilegeIncrease(const PermissionSet* old_permissions,
+                           const PermissionSet* new_permissions,
+                           Manifest::Type extension_type) const override {
     // Ensure we implement this before shipping.
     CHECK(false);
     return false;
   }
 
  private:
   DISALLOW_COPY_AND_ASSIGN(ShellPermissionMessageProvider);
 };
 
 base::LazyInstance<ShellPermissionMessageProvider>
@@ skipping 128 matching lines @@
   return extension_urls::kChromeWebstoreUpdateURL;
 }
 
 bool ShellExtensionsClient::IsBlacklistUpdateURL(const GURL& url) const {
   // TODO(rockot): Maybe we want to do something else here. For now we accept
   // any URL as a blacklist URL because we don't really care.
   return true;
 }
 
 }  // namespace extensions