Standardize usage of virtual/override/final specifiers.

content/renderer/render_thread_impl_unittest.cc

 // Copyright (c) 2012 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 "content/renderer/render_thread_impl.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 #include <string>
 
 namespace content {
 
 class RenderThreadImplUnittest : public testing::Test {
  public:
   RenderThreadImplUnittest()
       : kCustomizableHistogram_("Histogram1"),
         kNormalHistogram_("Histogram2") {}
-  virtual ~RenderThreadImplUnittest() {}
+  ~RenderThreadImplUnittest() override {}
+
  protected:
-  virtual void SetUp() override {
+  void SetUp() override {
     histogram_customizer_.custom_histograms_.clear();
     histogram_customizer_.custom_histograms_.insert(kCustomizableHistogram_);
   }
   RenderThreadImpl::HistogramCustomizer histogram_customizer_;
   const char* kCustomizableHistogram_;
   const char* kNormalHistogram_;
 };
 
 TEST_F(RenderThreadImplUnittest, CustomHistogramsWithNoNavigations) {
   // First there is no page -> no custom histograms.
@@ skipping 43 matching lines @@
                 kCustomizableHistogram_));
   // After this point, there will never be a custom diagram again, even if the
   // view navigated back to the common host.
   histogram_customizer_.RenderViewNavigatedToHost("mail.google.com", 2);
   EXPECT_EQ(kCustomizableHistogram_,
             histogram_customizer_.ConvertToCustomHistogramName(
                 kCustomizableHistogram_));
 }
 
 }  // namespace content