Enable strict-virtual-specifiers for iOS builds.

base/message_loop/message_pump_mac.h

 // Copyright (c) 2012 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.
 
 // The basis for all native run loops on the Mac is the CFRunLoop.  It can be
 // used directly, it can be used as the driving force behind the similar
 // Foundation NSRunLoop, and it can be used to implement higher-level event
 // loops such as the NSApplication event loop.
 //
 // This file introduces a basic CFRunLoop-based implementation of the
@@ skipping 245 matching lines @@
   DISALLOW_COPY_AND_ASSIGN(MessagePumpNSRunLoop);
 };
 
 #if defined(OS_IOS)
 // This is a fake message pump.  It attaches sources to the main thread's
 // CFRunLoop, so PostTask() will work, but it is unable to drive the loop
 // directly, so calling Run() or Quit() are errors.
 class MessagePumpUIApplication : public MessagePumpCFRunLoopBase {
  public:
   MessagePumpUIApplication();
-  virtual ~MessagePumpUIApplication();
-  virtual void DoRun(Delegate* delegate) override;
-  virtual void Quit() override;
+  ~MessagePumpUIApplication() override;
+  void DoRun(Delegate* delegate) override;
+  void Quit() override;
 
   // This message pump can not spin the main message loop directly.  Instead,
   // call |Attach()| to set up a delegate.  It is an error to call |Run()|.
   virtual void Attach(Delegate* delegate);
 
  private:
   RunLoop* run_loop_;
 
   DISALLOW_COPY_AND_ASSIGN(MessagePumpUIApplication);
 };
@@ skipping 65 matching lines @@
   DISALLOW_IMPLICIT_CONSTRUCTORS(MessagePumpMac);
 };
 
 // Tasks posted to the message loop are posted under this mode, as well
 // as kCFRunLoopCommonModes.
 extern const CFStringRef BASE_EXPORT kMessageLoopExclusiveRunLoopMode;
 
 }  // namespace base
 
 #endif  // BASE_MESSAGE_LOOP_MESSAGE_PUMP_MAC_H_