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

base/synchronization/lock_impl.h

Index: base/synchronization/lock_impl.h
===================================================================
--- base/synchronization/lock_impl.h	(revision 79303)
+++ base/synchronization/lock_impl.h	(working copy)
@@ -14,7 +14,6 @@
 #include <pthread.h>
 #endif
 
-#include "base/base_api.h"
 #include "base/basictypes.h"
 
 namespace base {
@@ -23,7 +22,7 @@
 // This class implements the underlying platform-specific spin-lock mechanism
 // used for the Lock class.  Most users should not use LockImpl directly, but
 // should instead use Lock.
-class BASE_API LockImpl {
+class LockImpl {
  public:
 #if defined(OS_WIN)
   typedef CRITICAL_SECTION OSLockType;