don't use COMPILER_MSVC in pp_macros.h

ppapi/c/pp_macros.h

Index: ppapi/c/pp_macros.h
diff --git a/ppapi/c/pp_macros.h b/ppapi/c/pp_macros.h
index 22beebf1298214c87ff5dfe2e9984ba6d5074532..7d4429e8cad853591fce594481edd15b777217c3 100644
--- a/ppapi/c/pp_macros.h
+++ b/ppapi/c/pp_macros.h
@@ -1,9 +1,9 @@
-/* Copyright (c) 2011 The Chromium Authors. All rights reserved.
+/* Copyright (c) 2012 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.
  */
 
-/* From pp_macros.idl modified Thu Dec  8 23:25:05 2011. */
+/* From pp_macros.idl modified Wed Aug 15 17:29:43 2012. */
 
 #ifndef PPAPI_C_PP_MACROS_H_
 #define PPAPI_C_PP_MACROS_H_
@@ -99,7 +99,7 @@ PP_COMPILE_ASSERT_SIZE_IN_BYTES_IMPL(NAME, enum NAME, SIZE)
    Foo::Foo(MyInstance* instance)
        : PP_ALLOW_THIS_IN_INITIALIZER_LIST(callback_factory_(this)) {}
  */
-#if defined(COMPILER_MSVC)
+#if defined(_MSC_VER)
 # define PP_ALLOW_THIS_IN_INITIALIZER_LIST(code) \
     __pragma(warning(push)) \
     __pragma(warning(disable:4355)) \