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

base/environment.h

Index: base/environment.h
===================================================================
--- base/environment.h	(revision 78949)
+++ base/environment.h	(working copy)
@@ -1,4 +1,4 @@
-// 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.
 
@@ -8,6 +8,7 @@
 
 #include <string>
 
+#include "base/base_api.h"
 #include "base/basictypes.h"
 
 namespace base {
@@ -20,7 +21,7 @@
 
 }  // namespace env_vars
 
-class Environment {
+class BASE_API Environment {
  public:
   virtual ~Environment();