Fix virtual/override/final usage in Source/platform/.

Source/platform/TestingPlatformSupport.h

 /*
  * Copyright (C) 2014 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 22 matching lines @@
 
 #include "public/platform/Platform.h"
 #include "public/platform/WebDiscardableMemory.h"
 #include "wtf/Vector.h"
 
 namespace blink {
 
 class TestingDiscardableMemory : public WebDiscardableMemory {
 public:
     explicit TestingDiscardableMemory(size_t);
-    virtual ~TestingDiscardableMemory();
+    ~TestingDiscardableMemory() override;
 
     // WebDiscardableMemory:
-    virtual bool lock() override;
-    virtual void* data() override;
-    virtual void unlock() override;
+    bool lock() override;
+    void* data() override;
+    void unlock() override;
 
 private:
     Vector<char> m_data;
     bool m_isLocked;
 };
 
 class TestingPlatformSupport : public Platform {
 public:
     struct Config {
         Config() : hasDiscardableMemorySupport(false) { }
 
         bool hasDiscardableMemorySupport;
     };
 
     explicit TestingPlatformSupport(const Config&);
 
-    virtual ~TestingPlatformSupport();
+    ~TestingPlatformSupport() override;
 
     // Platform:
-    virtual WebDiscardableMemory* allocateAndLockDiscardableMemory(size_t bytes) override;
-    virtual void cryptographicallyRandomValues(unsigned char* buffer, size_t length) override;
-    virtual const unsigned char* getTraceCategoryEnabledFlag(const char* categoryName) override;
-    virtual WebString defaultLocale() override;
+    WebDiscardableMemory* allocateAndLockDiscardableMemory(size_t bytes) override;
+    void cryptographicallyRandomValues(unsigned char* buffer, size_t length) override;
+    const unsigned char* getTraceCategoryEnabledFlag(const char* categoryName) override;
+    WebString defaultLocale() override;
 
 private:
     const Config m_config;
     Platform* const m_oldPlatform;
 };
 
 } // namespace blink
 
 #endif // TestingPlatformSupport_h