Some more virtual/override updates.

mojo/public/cpp/environment/tests/logging_unittest.cc

 // 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 <stdlib.h>
 
 #include <sstream>
 #include <string>
 
 #include "mojo/public/cpp/environment/environment.h"
@@ skipping 17 matching lines @@
   *was_called = true;
   return false;
 }
 
 class LoggingTest : public testing::Test {
  public:
   LoggingTest() : environment_(nullptr, &kMockLogger) {
     minimum_log_level_ = MOJO_LOG_LEVEL_INFO;
     ResetMockLogger();
   }
-  virtual ~LoggingTest() {}
+  ~LoggingTest() override {}
 
  protected:
   // Note: Does not reset |minimum_log_level_|.
   static void ResetMockLogger() {
     log_message_was_called_ = false;
     last_log_level_ = MOJO_LOG_LEVEL_INFO;
     last_message_.clear();
   }
 
   // A function returning |bool| that shouldn't be called.
@@ skipping 421 matching lines @@
   ResetMockLogger();
 
   // Also try to make sure that we parenthesize the condition properly.
   bool x = true;
   MOJO_DCHECK(false || x) << "hello";
   EXPECT_FALSE(log_message_was_called());
 }
 
 }  // namespace
 }  // namespace mojo