Update code to current Chromium master

This corresponds to:

Chromium: 6555f9456074c0c0e5f7713564b978588ac04a5d
webrtc: c8b569e0a7ad0b369e15f0197b3a558699ec8efa

webrtc/system_wrappers/include/fix_interlocked_exchange_pointer_win.h

@@ -0,0 +1,39 @@
+/*
+ *  Copyright (c) 2013 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+// Various inline functions and macros to fix compilation of 32 bit target
+// on MSVC with /Wp64 flag enabled.
+
+// The original code can be found here:
+// http://src.chromium.org/svn/trunk/src/base/fix_wp64.h
+
+#ifndef WEBRTC_SYSTEM_WRAPPERS_SOURCE_FIX_INTERLOCKED_EXCHANGE_POINTER_WINDOWS_H_
+#define WEBRTC_SYSTEM_WRAPPERS_SOURCE_FIX_INTERLOCKED_EXCHANGE_POINTER_WINDOWS_H_
+
+#include <windows.h>
+
+// Platform SDK fixes when building with /Wp64 for a 32 bits target.
+#if !defined(_WIN64) && defined(_Wp64)
+
+#ifdef InterlockedExchangePointer
+#undef InterlockedExchangePointer
+// The problem is that the macro provided for InterlockedExchangePointer() is
+// doing a (LONG) C-style cast that triggers invariably the warning C4312 when
+// building on 32 bits.
+inline void* InterlockedExchangePointer(void* volatile* target, void* value) {
+  return reinterpret_cast<void*>(static_cast<LONG_PTR>(InterlockedExchange(
+      reinterpret_cast<volatile LONG*>(target),
+      static_cast<LONG>(reinterpret_cast<LONG_PTR>(value)))));
+}
+#endif  // #ifdef InterlockedExchangePointer
+
+#endif // #if !defined(_WIN64) && defined(_Wp64)
+
+#endif // WEBRTC_SYSTEM_WRAPPERS_SOURCE_FIX_INTERLOCKED_EXCHANGE_POINTER_WINDOWS_H_