Add virtual and OVERRIDE to base/ implementation files

base/environment.cc

 // Copyright (c) 2011 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"
 
 #if defined(OS_POSIX)
 #include <stdlib.h>
 #elif defined(OS_WIN)
 #include <windows.h>
 #endif
 
 #include "base/string_util.h"
 
 #if defined(OS_WIN)
 #include "base/memory/scoped_ptr.h"
 #include "base/utf_string_conversions.h"
 #endif
 
 namespace {
 
 class EnvironmentImpl : public base::Environment {
  public:
-  virtual bool GetVar(const char* variable_name, std::string* result) {
+  virtual 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 = 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) {
+  virtual 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) {
+  virtual 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 58 matching lines @@
 // static
 Environment* Environment::Create() {
   return new EnvironmentImpl();
 }
 
 bool Environment::HasVar(const char* variable_name) {
   return GetVar(variable_name, NULL);
 }
 
 }  // namespace base