Bug 1317258 - Call HoldJSObjects in VRFrameData's ctor. r=smaug

--HG--
extra : rebase_source : b9143b7c02652002923222b908b96bcc88a8effc

dom/vr/VRDisplay.cpp

@@ -637,6 +637,7 @@ VRFrameData::VRFrameData(nsISupports* aParent)
   , mRightProjectionMatrix(nullptr)
   , mRightViewMatrix(nullptr)
 {
+  mozilla::HoldJSObjects(this);
   mPose = new VRPose(aParent);
 }