[turbolizer] Fix a latent bug when dragging a node under another node.

BUG=
R=danno

Review-Url: https://codereview.chromium.org/2169023002
Cr-Commit-Position: refs/heads/master@{#38004}

tools/turbolizer/graph-view.js

@@ -469,21 +469,6 @@ class GraphView extends View {
 
     if (!mouseDownNode) return;
 
-    if (mouseDownNode !== d){
-      // we're in a different node: create new edge for mousedown edge and add to graph
-      var newEdge = {source: mouseDownNode, target: d};
-      var filtRes = graph.visibleEdges.filter(function(d){
-        if (d.source === newEdge.target && d.target === newEdge.source){
-          graph.edges.splice(graph.edges.indexOf(d), 1);
-        }
-        return d.source === newEdge.source && d.target === newEdge.target;
-      });
-      if (!filtRes[0].length){
-        graph.edges.push(newEdge);
-        graph.updateGraphVisibility();
-      }
-    } else{
-      // we're in the same node
     if (state.justDragged) {
       // dragged, not clicked
       state.justDragged = false;
@@ -497,7 +482,6 @@ class GraphView extends View {
       selection.select(d3node[0][0], true);
     }
   }
-  }
 
   selectSourcePositions(start, end, selected) {
     var graph = this;