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

Source/web/ImageDecodeBench.cpp

 // Copyright 2015 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.
 
 #ifdef WTF
 
 Provides a minimal wrapping of the Blink image decoders. Used to perform
 a non-threaded, memory-to-memory image decode using micro second accuracy
 clocks to measure image decode time. Optionally applies color correction
 during image decoding on supported platforms (default off). Usage:
@@ skipping 320 matching lines @@
         const unsigned char* getTraceCategoryEnabledFlag(const char*) override
         {
             return reinterpret_cast<const unsigned char *>("nope-none-nada");
         }
 
         void cryptographicallyRandomValues(unsigned char*, size_t) override
         {
             // Do nothing: make blink::Platform use the default crypto-randoms.
         }
 
-        virtual void screenColorProfile(WebVector<char>* profile) override
+        void screenColorProfile(WebVector<char>* profile) override
         {
             getScreenColorProfile(profile); // Returns a whacked color profile.
         }
     };
 
     blink::initializeWithoutV8(new WebPlatform());
 
     // Set image decoding Platform options.
 
 #if USE(QCMSLIB)
@@ skipping 22 matching lines @@
             exit(3);
         }
     }
 
     // Results to stdout.
 
     double averageTime = totalTime / static_cast<double>(iterations);
     printf("%f %f\n", totalTime, averageTime);
     return 0;
 }