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

Source/platform/fonts/GlyphPageTreeNodeTest.cpp

 // Copyright 2014 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 "platform/fonts/GlyphPageTreeNode.h"
 
 #include "platform/fonts/SegmentedFontData.h"
 #include "platform/fonts/SimpleFontData.h"
 #include <gtest/gtest.h>
 
 namespace blink {
 
 namespace {
 
 class TestCustomFontData : public CustomFontData {
 public:
     static PassRefPtr<TestCustomFontData> create() { return adoptRef(new TestCustomFontData()); }
 private:
     TestCustomFontData() { }
-    virtual bool isLoadingFallback() const override { return true; }
+    bool isLoadingFallback() const override { return true; }
 };
 
 class TestSimpleFontData : public SimpleFontData {
 public:
     static PassRefPtr<TestSimpleFontData> create(UChar32 from, UChar32 to)
     {
         return adoptRef(new TestSimpleFontData(nullptr, from, to));
     }
 
     static PassRefPtr<TestSimpleFontData> createUnloaded(UChar32 from, UChar32 to)
@@ skipping 212 matching lines @@
     EXPECT_NE(commonPage, latinPage);
     EXPECT_NE(commonPage, simplifiedChinesePage);
     EXPECT_NE(commonPage, traditionalChinesePage);
     EXPECT_NE(simplifiedChinesePage, traditionalChinesePage);
     EXPECT_NE(commonPage, japanesePage);
     EXPECT_NE(japanesePage, simplifiedChinesePage);
     EXPECT_NE(japanesePage, traditionalChinesePage);
 }
 
 } // namespace blink