Remove support for MSVC

sky/engine/wtf/NullPtr.cpp

Index: sky/engine/wtf/NullPtr.cpp
diff --git a/sky/engine/wtf/NullPtr.cpp b/sky/engine/wtf/NullPtr.cpp
deleted file mode 100644
index 4f6bfa39d03c2bb6708d33a932b5762683d3275a..0000000000000000000000000000000000000000
--- a/sky/engine/wtf/NullPtr.cpp
+++ /dev/null
@@ -1,34 +0,0 @@
-/*
-
-Copyright (C) 2010 Apple Inc. All rights reserved.
-
-Redistribution and use in source and binary forms, with or without
-modification, are permitted provided that the following conditions
-are met:
-1.  Redistributions of source code must retain the above copyright
-    notice, this list of conditions and the following disclaimer.
-2.  Redistributions in binary form must reproduce the above copyright
-    notice, this list of conditions and the following disclaimer in the
-    documentation and/or other materials provided with the distribution.
-
-THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS'' AND ANY
-EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
-WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
-DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS BE LIABLE FOR ANY
-DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
-(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
-LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
-ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
-SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-*/
-
-#include "config.h"
-#include "NullPtr.h"
-
-#if !(COMPILER_SUPPORTS(CXX_NULLPTR) || defined(_LIBCPP_VERSION))
-
-const std::nullptr_t nullptr;
-
-#endif