replace 'virtual ... OVERRIDE' with '... override'

base/environment.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 "base/environment.h"
 
 #include <vector>
 
 #include "base/strings/string_piece.h"
 #include "base/strings/string_util.h"
 #include "base/strings/utf_string_conversions.h"
 
 #if defined(OS_POSIX)
 #include <stdlib.h>
 #elif defined(OS_WIN)
 #include <windows.h>
 #endif
 
 namespace base {
 
 namespace {
 
 class EnvironmentImpl : public base::Environment {
  public:
-  virtual bool GetVar(const char* variable_name,
-                      std::string* result) OVERRIDE {
+  bool GetVar(const char* variable_name, std::string* result) override {
     if (GetVarImpl(variable_name, result))
       return true;
 
     // Some commonly used variable names are uppercase while others
     // are lowercase, which is inconsistent. Let's try to be helpful
     // and look for a variable name with the reverse case.
     // I.e. HTTP_PROXY may be http_proxy for some users/systems.
     char first_char = variable_name[0];
     std::string alternate_case_var;
     if (first_char >= 'a' && first_char <= 'z')
       alternate_case_var = StringToUpperASCII(std::string(variable_name));
     else if (first_char >= 'A' && first_char <= 'Z')
       alternate_case_var = base::StringToLowerASCII(std::string(variable_name));
     else
       return false;
     return GetVarImpl(alternate_case_var.c_str(), result);
   }
 
-  virtual bool SetVar(const char* variable_name,
-                      const std::string& new_value) OVERRIDE {
+  bool SetVar(const char* variable_name,
+              const std::string& new_value) override {
     return SetVarImpl(variable_name, new_value);
   }
 
-  virtual bool UnSetVar(const char* variable_name) OVERRIDE {
+  bool UnSetVar(const char* variable_name) override {
     return UnSetVarImpl(variable_name);
   }
 
  private:
   bool GetVarImpl(const char* variable_name, std::string* result) {
 #if defined(OS_POSIX)
     const char* env_value = getenv(variable_name);
     if (!env_value)
       return false;
     // Note that the variable may be defined but empty.
@@ skipping 167 matching lines @@
   for (size_t i = 0; i < result_indices.size(); i++)
     result[i] = &storage_data[result_indices[i]];
   result[result_indices.size()] = 0;  // Null terminator.
 
   return result.Pass();
 }
 
 #endif  // OS_POSIX
 
 }  // namespace base