don't use COMPILER_MSVC in pp_macros.h

ppapi/c/pp_macros.h

-/* 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_
 
 
 /**
  * @file
  * Defines the API ...
  */
 
@@ skipping 75 matching lines @@
  */
 #define PP_COMPILE_ASSERT_ENUM_SIZE_IN_BYTES(NAME, SIZE) \
 PP_COMPILE_ASSERT_SIZE_IN_BYTES_IMPL(NAME, enum NAME, SIZE)
 
 /* This is roughly copied from base/compiler_specific.h, and makes it possible
    to pass 'this' in a constructor initializer list, when you really mean it.
    E.g.:
    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)) \
     code \
     __pragma(warning(pop))
 #else
 # define PP_ALLOW_THIS_IN_INITIALIZER_LIST(code) code
 #endif
 
 /**
  * @}
  * End of addtogroup PP
  */
 
 #endif  /* PPAPI_C_PP_MACROS_H_ */