Base: A few more files using BASE_API (for base.dll)

base/environment.h

-// Copyright (c) 2010 The Chromium Authors. All rights reserved.
+// 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.
 
 #ifndef BASE_ENVIRONMENT_H_
 #define BASE_ENVIRONMENT_H_
 #pragma once
 
 #include <string>
 
+#include "base/base_api.h"
 #include "base/basictypes.h"
 
 namespace base {
 
 namespace env_vars {
 
 #if defined(OS_POSIX)
 extern const char kHome[];
 #endif
 
 }  // namespace env_vars
 
-class Environment {
+class BASE_API Environment {
  public:
   virtual ~Environment();
 
   // Static factory method that returns the implementation that provide the
   // appropriate platform-specific instance.
   static Environment* Create();
 
   // Gets an environment variable's value and stores it in |result|.
   // Returns false if the key is unset.
   virtual bool GetVar(const char* variable_name, std::string* result) = 0;
 
   // Syntactic sugar for GetVar(variable_name, NULL);
   virtual bool HasVar(const char* variable_name);
 
   // Returns true on success, otherwise returns false.
   virtual bool SetVar(const char* variable_name,
                       const std::string& new_value) = 0;
 
   // Returns true on success, otherwise returns false.
   virtual bool UnSetVar(const char* variable_name) = 0;
 };
 
 }  // namespace base
 
 #endif  // BASE_ENVIRONMENT_H_