Fix virtual/override/final usage in Source/core/{fetch,loader,streams,xmlhttprequest}/.

Source/core/loader/LinkLoaderTest.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.
 
 #include "config.h"
 #include "core/loader/LinkLoader.h"
 
 #include "core/fetch/ResourceFetcher.h"
 #include "core/html/LinkRelAttribute.h"
 #include "core/loader/LinkLoaderClient.h"
 #include "core/testing/DummyPageHolder.h"
 #include "platform/network/ResourceLoadPriority.h"
 
 #include <base/macros.h>
 #include <gtest/gtest.h>
 
 namespace blink {
 
 class MockLinkLoaderClient : public LinkLoaderClient {
 public:
     MockLinkLoaderClient(bool shouldLoad)
         : m_shouldLoad(shouldLoad)
     {
     }
 
-    virtual bool shouldLoadLink() override
+    bool shouldLoadLink() override
     {
         return m_shouldLoad;
     }
 
-    virtual void linkLoaded() override { }
-    virtual void linkLoadingErrored() override { }
-    virtual void didStartLinkPrerender() override { }
-    virtual void didStopLinkPrerender() override { }
-    virtual void didSendLoadForLinkPrerender() override { }
-    virtual void didSendDOMContentLoadedForLinkPrerender() override { }
+    void linkLoaded() override {}
+    void linkLoadingErrored() override {}
+    void didStartLinkPrerender() override {}
+    void didStopLinkPrerender() override {}
+    void didSendLoadForLinkPrerender() override {}
+    void didSendDOMContentLoadedForLinkPrerender() override {}
 
 private:
     bool m_shouldLoad;
 };
 
 TEST(LinkLoaderTest, Preload)
 {
     struct TestCase {
         const char* href;
         const char* as;
@@ skipping 22 matching lines @@
         if (testCase.priority == ResourceLoadPriorityUnresolved) {
             ASSERT(!loader.resource());
         } else {
             ASSERT(loader.resource());
             ASSERT_EQ(testCase.priority, loader.resource()->resourceRequest().priority());
         }
     }
 }
 
 } // namespace blink