Move needsPreviewElement to TimelineUIUtilsImple and make it private

Source/devtools/front_end/timeline/TimelineUIUtils.js

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  * Copyright (C) 2012 Intel Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
@@ skipping 195 matching lines @@
         result = {
             title: WebInspector.UIString("Unknown: %s", type),
             category: WebInspector.TimelineUIUtils.categories()["other"]
         };
         recordStyles[type] = result;
     }
     return result;
 }
 
 /**
- * @param {string=} recordType
- * @return {boolean}
- */
-WebInspector.TimelineUIUtils.needsPreviewElement = function(recordType)
-{
-    if (!recordType)
-        return false;
-    const recordTypes = WebInspector.TimelineModel.RecordType;
-    switch (recordType) {
-    case recordTypes.ResourceSendRequest:
-    case recordTypes.ResourceReceiveResponse:
-    case recordTypes.ResourceReceivedData:
-    case recordTypes.ResourceFinish:
-        return true;
-    default:
-        return false;
-    }
-}
-
-/**
  * @param {!WebInspector.TimelineModel} model
  * @param {!{name: string, tasks: !Array.<!{startTime: number, endTime: number}>, firstTaskIndex: number, lastTaskIndex: number}} info
  * @return {!Element}
  */
 WebInspector.TimelineUIUtils.generateMainThreadBarPopupContent = function(model, info)
 {
     var firstTaskIndex = info.firstTaskIndex;
     var lastTaskIndex = info.lastTaskIndex;
     var tasks = info.tasks;
     var messageCount = lastTaskIndex - firstTaskIndex + 1;
@@ skipping 414 matching lines @@
         for (var i = 0; i < stackTrace.length; ++i) {
             var stackFrame = stackTrace[i];
             var row = stackTraceElement.createChild("div");
             row.createTextChild(stackFrame.functionName || WebInspector.UIString("(anonymous function)"));
             row.createTextChild(" @ ");
             var urlElement = this._linkifier.linkifyLocation(this._target, stackFrame.url, stackFrame.lineNumber - 1);
             row.appendChild(urlElement);
         }
     }
 }