Include the MSan interface header in base/compiler_specific.h.

base/compiler_specific.h

 // 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.
 
 #ifndef BASE_COMPILER_SPECIFIC_H_
 #define BASE_COMPILER_SPECIFIC_H_
 
 #include "build/build_config.h"
 
 #if defined(COMPILER_MSVC)
@@ skipping 181 matching lines @@
 // WPRINTF_FORMAT is the same, but for wide format strings.
 // This doesn't appear to yet be implemented in any compiler.
 // See http://gcc.gnu.org/bugzilla/show_bug.cgi?id=38308 .
 #define WPRINTF_FORMAT(format_param, dots_param)
 // If available, it would look like:
 //   __attribute__((format(wprintf, format_param, dots_param)))
 
 
 // MemorySanitizer annotations.
 #ifdef MEMORY_SANITIZER
-extern "C" {
-void __msan_unpoison(const void *p, unsigned long s);
-}  // extern "C"
+#include <sanitizer/msan_interface.h>
 
 // Mark a memory region fully initialized.
 // Use this to annotate code that deliberately reads uninitialized data, for
 // example a GC scavenging root set pointers from the stack.
 #define MSAN_UNPOISON(p, s)  __msan_unpoison(p, s)
 #else  // MEMORY_SANITIZER
 #define MSAN_UNPOISON(p, s)
 #endif  // MEMORY_SANITIZER
 
 // Macro useful for writing cross-platform function pointers.
 #if !defined(CDECL)
 #if defined(OS_WIN)
 #define CDECL __cdecl
 #else  // defined(OS_WIN)
 #define CDECL
 #endif  // defined(OS_WIN)
 #endif  // !defined(CDECL)
 
 #endif  // BASE_COMPILER_SPECIFIC_H_