PPAPI/NaCl: Make NaClIPCAdapter transfer handles more generally

ppapi/shared_impl/ppb_device_ref_shared.cc

Index: ppapi/shared_impl/ppb_device_ref_shared.cc
diff --git a/ppapi/shared_impl/ppb_device_ref_shared.cc b/ppapi/shared_impl/ppb_device_ref_shared.cc
index 15a3a7bfcef48698ab4f85aa2d72e6f4f15d21a8..73a9a7c7d105db068c804a61c74678bc0972cfca 100644
--- a/ppapi/shared_impl/ppb_device_ref_shared.cc
+++ b/ppapi/shared_impl/ppb_device_ref_shared.cc
@@ -58,7 +58,8 @@ PP_Resource PPB_DeviceRef_Shared::CreateResourceArray(
     }
   }
   PPB_ResourceArray_Shared* array_object =
-      new PPB_ResourceArray_Shared(type, instance, elements.get(), size);
+      new PPB_ResourceArray_Shared(type, instance, elements.get(),
+                                   static_cast<uint32_t>(size));
 
   for (size_t index = 0; index < size; ++index)
     PpapiGlobals::Get()->GetResourceTracker()->ReleaseResource(elements[index]);