Update {virtual,override} to follow C++11 style in base.

base/test/gtest_xml_util.h

 // Copyright 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.
 
 #ifndef BASE_TEST_GTEST_XML_UTIL_H_
 #define BASE_TEST_GTEST_XML_UTIL_H_
 
 #include <vector>
 
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace base {
 
 class FilePath;
 struct TestResult;
 
 // Generates an XML output file. Format is very close to GTest, but has
 // extensions needed by the test launcher.
 class XmlUnitTestResultPrinter : public testing::EmptyTestEventListener {
  public:
   XmlUnitTestResultPrinter();
-  virtual ~XmlUnitTestResultPrinter();
+  ~XmlUnitTestResultPrinter() override;
 
   // Must be called before adding as a listener. Returns true on success.
   bool Initialize(const FilePath& output_file_path) WARN_UNUSED_RESULT;
 
  private:
   // testing::EmptyTestEventListener:
-  virtual void OnTestCaseStart(const testing::TestCase& test_case) override;
-  virtual void OnTestStart(const testing::TestInfo& test_info) override;
-  virtual void OnTestEnd(const testing::TestInfo& test_info) override;
-  virtual void OnTestCaseEnd(const testing::TestCase& test_case) override;
+  void OnTestCaseStart(const testing::TestCase& test_case) override;
+  void OnTestStart(const testing::TestInfo& test_info) override;
+  void OnTestEnd(const testing::TestInfo& test_info) override;
+  void OnTestCaseEnd(const testing::TestCase& test_case) override;
 
   FILE* output_file_;
 
   DISALLOW_COPY_AND_ASSIGN(XmlUnitTestResultPrinter);
 };
 
 // Produces a vector of test results based on GTest output file.
 // Returns true iff the output file exists and has been successfully parsed.
 // On successful return |crashed| is set to true if the test results
 // are valid but incomplete.
 bool ProcessGTestOutput(const base::FilePath& output_file,
                         std::vector<TestResult>* results,
                         bool* crashed) WARN_UNUSED_RESULT;
 
 }  // namespace base
 
 #endif  // BASE_TEST_GTEST_XML_UTIL_H_