Bug 1508908. Remove mEventRegions from WebRenderLayerScrollData. r=kats

It's unused.

Differential Revision: https://phabricator.services.mozilla.com/D12506

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

gfx/layers/wr/WebRenderScrollData.cpp

@@ -142,8 +142,7 @@ WebRenderLayerScrollData::Dump(const WebRenderScrollData& aOwner) const
   printf_stderr("  transform: %s perspective: %d visible: %s\n",
     Stringify(mTransform).c_str(), mTransformIsPerspective,
     Stringify(mVisibleRegion).c_str());
-  printf_stderr("  event regions: %s override: 0x%x\n",
-    Stringify(mEventRegions).c_str(), mEventRegionsOverride);
+  printf_stderr("  event regions override: 0x%x\n", mEventRegionsOverride);
   if (mReferentId) {
     printf_stderr("  ref layers id: 0x%" PRIx64 "\n", uint64_t(*mReferentId));
   }

gfx/layers/wr/WebRenderScrollData.h

@@ -69,8 +69,7 @@ public:
   void SetTransformIsPerspective(bool aTransformIsPerspective) { mTransformIsPerspective = aTransformIsPerspective; }
   bool GetTransformIsPerspective() const { return mTransformIsPerspective; }
 
-  void AddEventRegions(const EventRegions& aRegions) { mEventRegions.OrWith(aRegions); }
-  EventRegions GetEventRegions() const { return mEventRegions; }
+  EventRegions GetEventRegions() const { return EventRegions(); }
   void SetEventRegionsOverride(const EventRegionsOverride& aOverride) { mEventRegionsOverride = aOverride; }
   EventRegionsOverride GetEventRegionsOverride() const { return mEventRegionsOverride; }
 
@@ -113,7 +112,6 @@ private:
   gfx::Matrix4x4 mAncestorTransform;
   gfx::Matrix4x4 mTransform;
   bool mTransformIsPerspective;
-  EventRegions mEventRegions;
   LayerIntRegion mVisibleRegion;
   Maybe<LayersId> mReferentId;
   EventRegionsOverride mEventRegionsOverride;
@@ -234,7 +232,6 @@ struct ParamTraits<mozilla::layers::WebRenderLayerScrollData>
     WriteParam(aMsg, aParam.mAncestorTransform);
     WriteParam(aMsg, aParam.mTransform);
     WriteParam(aMsg, aParam.mTransformIsPerspective);
-    WriteParam(aMsg, aParam.mEventRegions);
     WriteParam(aMsg, aParam.mVisibleRegion);
     WriteParam(aMsg, aParam.mReferentId);
     WriteParam(aMsg, aParam.mEventRegionsOverride);
@@ -252,7 +249,6 @@ struct ParamTraits<mozilla::layers::WebRenderLayerScrollData>
         && ReadParam(aMsg, aIter, &aResult->mAncestorTransform)
         && ReadParam(aMsg, aIter, &aResult->mTransform)
         && ReadParam(aMsg, aIter, &aResult->mTransformIsPerspective)
-        && ReadParam(aMsg, aIter, &aResult->mEventRegions)
         && ReadParam(aMsg, aIter, &aResult->mVisibleRegion)
         && ReadParam(aMsg, aIter, &aResult->mReferentId)
         && ReadParam(aMsg, aIter, &aResult->mEventRegionsOverride)