DevTools: Do not linkify to pseudo (program) node when there's no URL

third_party/WebKit/Source/devtools/front_end/timeline/TimelineTreeView.js

Index: third_party/WebKit/Source/devtools/front_end/timeline/TimelineTreeView.js
diff --git a/third_party/WebKit/Source/devtools/front_end/timeline/TimelineTreeView.js b/third_party/WebKit/Source/devtools/front_end/timeline/TimelineTreeView.js
index 21471d7924f7a6ca14ebe64eaa8873000ce5ac8c..561ed3398a1fbe0a0ec4071f291fc7efa0ecdc50 100644
--- a/third_party/WebKit/Source/devtools/front_end/timeline/TimelineTreeView.js
+++ b/third_party/WebKit/Source/devtools/front_end/timeline/TimelineTreeView.js
@@ -82,11 +82,11 @@ WebInspector.TimelineTreeView.prototype = {
 
     /**
      * @param {!RuntimeAgent.CallFrame} frame
-     * @return {!Element}
+     * @return {?Element}
      */
     linkifyLocation: function(frame)
     {
-        return this._linkifier.linkifyConsoleCallFrameForTimeline(this._model.target(), frame);
+        return this._linkifier.maybeLinkifyConsoleCallFrameForTimeline(this._model.target(), frame);
     },
 
     /**
@@ -347,7 +347,9 @@ WebInspector.TimelineTreeView.GridNode.prototype = {
             var frame = WebInspector.TimelineProfileTree.eventStackFrame(event);
             if (frame && frame["url"]) {
                 var callFrame = /** @type {!RuntimeAgent.CallFrame} */ (frame);
-                container.createChild("div", "activity-link").appendChild(this._treeView.linkifyLocation(callFrame));
+                var link = this._treeView.linkifyLocation(callFrame);
+                if (link)
+                    container.createChild("div", "activity-link").appendChild(link);
             }
             icon.style.backgroundColor = WebInspector.TimelineUIUtils.eventColor(event);
         }