Bug 1607634 - Part 4b: Changes for not-nullable actor types being wrapped in NotNull, r=ipc-reviewers,necko-reviewers,mccr8

These are the code changes required by the IPDL changes in part 4a.

Differential Revision: https://phabricator.services.mozilla.com/D168887

gfx/layers/wr/WebRenderLayerManager.cpp

@@ -529,7 +529,8 @@ void WebRenderLayerManager::MakeSnapshotIfRequired(LayoutDeviceIntSize aSize) {
 
   IntRect bounds = ToOutsideIntRect(mTarget->GetClipExtents());
   bool needsYFlip = false;
-  if (!WrBridge()->SendGetSnapshot(texture->GetIPDLActor(), &needsYFlip)) {
+  if (!WrBridge()->SendGetSnapshot(WrapNotNull(texture->GetIPDLActor()),
+                                   &needsYFlip)) {
     return;
   }