Bug 1597211 - Do not cast IPC message size to signed int. r=jld

Differential Revision: https://phabricator.services.mozilla.com/D53793

--HG--
extra : moz-landing-system : lando

ipc/glue/MessageLink.cpp

@@ -147,7 +147,7 @@ void ProcessLink::SendMessage(Message* msg) {
         nsDependentCString(msg->name()));
     CrashReporter::AnnotateCrashReport(
         CrashReporter::Annotation::IPCMessageSize,
-        static_cast<int>(msg->size()));
+        static_cast<unsigned int>(msg->size()));
     MOZ_CRASH("IPC message size is too large");
   }