Enable strict-virtual-specifiers for iOS builds.

ios/web/navigation/navigation_item_impl.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 IOS_WEB_NAVIGATION_NAVIGATION_ITEM_IMPL_H_
 #define IOS_WEB_NAVIGATION_NAVIGATION_ITEM_IMPL_H_
 
 #include "base/basictypes.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/strings/string16.h"
 #include "ios/web/public/favicon_status.h"
 #include "ios/web/public/navigation_item.h"
 #include "ios/web/public/referrer.h"
 #include "ios/web/public/ssl_status.h"
 #include "url/gurl.h"
 
 namespace web {
 
 // Implementation of NavigationItem.
 class NavigationItemImpl : public web::NavigationItem {
  public:
   // Creates a default NavigationItemImpl.
   NavigationItemImpl();
-  virtual ~NavigationItemImpl();
+  ~NavigationItemImpl() override;
 
   // NavigationItem implementation:
-  virtual int GetUniqueID() const override;
-  virtual void SetURL(const GURL& url) override;
-  virtual const GURL& GetURL() const override;
-  virtual void SetReferrer(const web::Referrer& referrer) override;
-  virtual const web::Referrer& GetReferrer() const override;
-  virtual void SetVirtualURL(const GURL& url) override;
-  virtual const GURL& GetVirtualURL() const override;
-  virtual void SetTitle(const base::string16& title) override;
-  virtual const base::string16& GetTitle() const override;
-  virtual void SetPageID(int page_id) override;
-  virtual int32 GetPageID() const override;
-  virtual const base::string16& GetTitleForDisplay(
+  int GetUniqueID() const override;
+  void SetURL(const GURL& url) override;
+  const GURL& GetURL() const override;
+  void SetReferrer(const web::Referrer& referrer) override;
+  const web::Referrer& GetReferrer() const override;
+  void SetVirtualURL(const GURL& url) override;
+  const GURL& GetVirtualURL() const override;
+  void SetTitle(const base::string16& title) override;
+  const base::string16& GetTitle() const override;
+  void SetPageID(int page_id) override;
+  int32 GetPageID() const override;
+  const base::string16& GetTitleForDisplay(
       const std::string& languages) const override;
-  virtual void SetTransitionType(ui::PageTransition transition_type) override;
-  virtual ui::PageTransition GetTransitionType() const override;
-  virtual const FaviconStatus& GetFavicon() const override;
-  virtual FaviconStatus& GetFavicon() override;
-  virtual const SSLStatus& GetSSL() const override;
-  virtual SSLStatus& GetSSL() override;
-  virtual void SetTimestamp(base::Time timestamp) override;
-  virtual base::Time GetTimestamp() const override;
+  void SetTransitionType(ui::PageTransition transition_type) override;
+  ui::PageTransition GetTransitionType() const override;
+  const FaviconStatus& GetFavicon() const override;
+  FaviconStatus& GetFavicon() override;
+  const SSLStatus& GetSSL() const override;
+  SSLStatus& GetSSL() override;
+  void SetTimestamp(base::Time timestamp) override;
+  base::Time GetTimestamp() const override;
 
  private:
   int unique_id_;
   GURL url_;
   Referrer referrer_;
   GURL virtual_url_;
   base::string16 title_;
   int32 page_id_;
   ui::PageTransition transition_type_;
   FaviconStatus favicon_;
   SSLStatus ssl_;
   base::Time timestamp_;
 
   // This is a cached version of the result of GetTitleForDisplay. When the URL,
   // virtual URL, or title is set, this should be cleared to force a refresh.
   mutable base::string16 cached_display_title_;
 
   // Copy and assignment is explicitly allowed for this class.
 };
 
 }  // namespace web
 
 #endif  // IOS_WEB_NAVIGATION_NAVIGATION_ITEM_IMPL_H_