win: Get Crashpad compiling under VS2015

test/win/win_child_process.cc

Index: test/win/win_child_process.cc
diff --git a/test/win/win_child_process.cc b/test/win/win_child_process.cc
index b0efa462373c0436d07e4a3ff74f0456c0414132..577b6b6356196878c095a7d3c92bc366fd75a183 100644
--- a/test/win/win_child_process.cc
+++ b/test/win/win_child_process.cc
@@ -152,8 +152,8 @@ WinChildProcess::WinChildProcess() {
   unsigned int write, read;
   CHECK(StringToNumber(left, &write));
   CHECK(StringToNumber(right, &read));
-  pipe_write_.reset(reinterpret_cast<HANDLE>(write));
-  pipe_read_.reset(reinterpret_cast<HANDLE>(read));
+  pipe_write_.reset(reinterpret_cast<HANDLE>(static_cast<uintptr_t>(write)));
+  pipe_read_.reset(reinterpret_cast<HANDLE>(static_cast<uintptr_t>(read)));
 
   // Notify the parent that it's OK to proceed. We only need to wait to get to
   // the process entry point, but this is the easiest place we can notify.