Don't mount nodes to Views on click

Summary:
Initially, we used to mount nodes to Views anytime a node was
clicked. This was not useful, since we could still not handle touch when
a touch event was already dispatched. Later, a fix was pushed that
supported handling touch events for non-View NodeRegions. Part of the
intention was to remove this code, but it was forgotten.

Reviewed By: sriramramani

Differential Revision: D3160532

ReactAndroid/src/main/java/com/facebook/react/flat/FlatUIImplementation.java

@@ -453,13 +453,9 @@ public class FlatUIImplementation extends UIImplementation {
       node = node.getParent();
     }
 
-    FlatShadowNode nonVirtualNode = (FlatShadowNode) node;
-    nonVirtualNode.forceMountToView();
-    mStateBuilder.ensureBackingViewIsCreated(nonVirtualNode);
-
     FlatUIViewOperationQueue operationsQueue = mStateBuilder.getOperationsQueue();
     operationsQueue.enqueueSetJSResponder(
-        nonVirtualNode.getReactTag(),
+        node.getReactTag(),
         possiblyVirtualReactTag,
         blockNativeResponder);
   }