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

Source/platform/blob/BlobRegistry.cpp

 /*
  * Copyright (C) 2010 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 37 matching lines @@
 #include "wtf/ThreadSpecific.h"
 #include "wtf/Threading.h"
 #include "wtf/text/StringHash.h"
 #include "wtf/text/WTFString.h"
 
 namespace blink {
 
 class BlobOriginCache : public SecurityOriginCache {
 public:
     BlobOriginCache();
-    virtual SecurityOrigin* cachedOrigin(const KURL&) override;
+    SecurityOrigin* cachedOrigin(const KURL&) override;
 };
 
 static WebBlobRegistry* blobRegistry()
 {
     return Platform::current()->blobRegistry();
 }
 
 typedef HashMap<String, RefPtr<SecurityOrigin>> BlobURLOriginMap;
 static ThreadSpecific<BlobURLOriginMap>& originMap()
 {
@@ skipping 155 matching lines @@
 }
 
 SecurityOrigin* BlobOriginCache::cachedOrigin(const KURL& url)
 {
     if (url.protocolIs("blob"))
         return originMap()->get(url.string());
     return 0;
 }
 
 } // namespace blink