Standardize usage of virtual/override/final specifiers.

chrome/browser/net/load_timing_browsertest.cc

 // Copyright (c) 2013 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 <string>
 
 #include "base/basictypes.h"
 #include "base/bind.h"
 #include "base/compiler_specific.h"
 #include "base/files/file_path.h"
@@ skipping 250 matching lines @@
   const TimingDeltas load_timing_deltas_;
 
   DISALLOW_COPY_AND_ASSIGN(TestInterceptor);
 };
 
 class LoadTimingBrowserTest : public InProcessBrowserTest {
  public:
   LoadTimingBrowserTest() {
   }
 
-  virtual ~LoadTimingBrowserTest() {
-  }
+  ~LoadTimingBrowserTest() override {}
 
   // Navigates to |url| and writes the resulting navigation timings to
   // |navigation_deltas|.
   void RunTestWithUrl(const GURL& url, TimingDeltas* navigation_deltas) {
     ui_test_utils::NavigateToURL(browser(), url);
     GetResultDeltas(navigation_deltas);
   }
 
   // Navigates to a url that returns the timings indicated by
   // |load_timing_deltas| and writes the resulting navigation timings to
@@ skipping 305 matching lines @@
             navigation_deltas.send_start.GetDelta());
   // The only times that are guaranteed to be distinct are send_start and
   // received_headers_end.
   EXPECT_LT(navigation_deltas.send_start.GetDelta(),
             navigation_deltas.receive_headers_end.GetDelta());
 
   EXPECT_TRUE(navigation_deltas.ssl_start.is_null());
 }
 
 }  // namespace