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

base/cpu.h

Index: base/cpu.h
===================================================================
--- base/cpu.h	(revision 79303)
+++ base/cpu.h	(working copy)
@@ -1,4 +1,4 @@
-// Copyright (c) 2006-2011 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.
 
@@ -6,14 +6,14 @@
 #define BASE_CPU_H_
 #pragma once
 
-#include "build/build_config.h"
-
 #include <string>
 
+#include "base/base_api.h"
+
 namespace base {
 
 // Query information about the processor.
-class CPU {
+class BASE_API CPU {
  public:
   // Constructor
   CPU();