Cleanup RemotePlatformLayer when disconnecting RemoteFrame.

Source/core/page/EventHandler.cpp

Index: Source/core/page/EventHandler.cpp
diff --git a/Source/core/page/EventHandler.cpp b/Source/core/page/EventHandler.cpp
index 4b01ae2602c2dced9c50c9ea9f0c44d23dd2bccc..52db5803ada61af0041e9a83972bb84788106a4e 100644
--- a/Source/core/page/EventHandler.cpp
+++ b/Source/core/page/EventHandler.cpp
@@ -981,10 +981,6 @@ static LocalFrame* subframeForTargetNode(Node* node)
     if (!renderer || !renderer->isRenderPart())
         return nullptr;
 
-    // FIXME: This explicit check is needed only until RemoteFrames have RemoteFrameViews.
-    if (isHTMLFrameElementBase(node) && toHTMLFrameElementBase(node)->contentFrame() && toHTMLFrameElementBase(node)->contentFrame()->isRemoteFrameTemporary())
-        return nullptr;
-
     Widget* widget = toRenderPart(renderer)->widget();
     if (!widget || !widget->isFrameView())
         return nullptr;