vs2015: fix narrowing warnings in sandbox/win/

sandbox/win/src/eat_resolver.cc

 // Copyright (c) 2006-2010 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.
 
 #include "sandbox/win/src/eat_resolver.h"
 
 #include "base/win/pe_image.h"
 #include "sandbox/win/src/sandbox_nt_util.h"
 
 namespace sandbox {
@@ skipping 27 matching lines @@
 
   if (!SetInternalThunk(thunk_storage, storage_bytes, target_, interceptor_))
     return STATUS_BUFFER_TOO_SMALL;
 
   AutoProtectMemory memory;
   ret = memory.ChangeProtection(eat_entry_, sizeof(DWORD), PAGE_READWRITE);
   if (!NT_SUCCESS(ret))
     return ret;
 
   // Perform the patch.
-#pragma warning(push)
-#pragma warning(disable: 4311)
-  // These casts generate warnings because they are 32 bit specific.
-  *eat_entry_ = reinterpret_cast<DWORD>(thunk_storage) -
-                reinterpret_cast<DWORD>(target_module);
-#pragma warning(pop)
+  *eat_entry_ = static_cast<DWORD>(reinterpret_cast<uintptr_t>(thunk_storage)) -
+                static_cast<DWORD>(reinterpret_cast<uintptr_t>(target_module));
 
   if (NULL != storage_used)
     *storage_used = GetThunkSize();
 
   return ret;
 }
 
 NTSTATUS EatResolverThunk::ResolveTarget(const void* module,
                                          const char* function_name,
                                          void** address) {
@@ skipping 17 matching lines @@
 
 size_t EatResolverThunk::GetThunkSize() const {
 #if defined(_WIN64)
   return GetInternalThunkSize() * 2;
 #else
   return GetInternalThunkSize();
 #endif
 }
 
 }  // namespace sandbox