win: Fix a few sign mismatch warnings in crashpad.

snapshot/win/process_reader_win.cc

Index: snapshot/win/process_reader_win.cc
diff --git a/snapshot/win/process_reader_win.cc b/snapshot/win/process_reader_win.cc
index 373124d61930f04e3fed8c82f6f0735362eaef7f..f3b632376a8b534672cbff5cfb72218818e83bf9 100644
--- a/snapshot/win/process_reader_win.cc
+++ b/snapshot/win/process_reader_win.cc
@@ -136,7 +136,7 @@ bool FillThreadContextAndSuspendCount(HANDLE thread_handle,
     CaptureContext(&thread->context.native);
   } else {
     DWORD previous_suspend_count = SuspendThread(thread_handle);
-    if (previous_suspend_count == -1) {
+    if (previous_suspend_count == static_cast<DWORD>(-1)) {

[Mark Mentovai, 2015/12/08 22:05:59]

-1u?

[Nico, 2015/12/08 22:07:12]

MSDN says that SuspendThread returns "(DWORD)-1" on error, I figured it's nicer
to look closer to that.

       PLOG(ERROR) << "SuspendThread";
       return false;
     }