DevTools: followup fix for r179113. It provides an empty base implementation of setMergeRecords.

Source/devtools/front_end/timeline/TimelineFrameModel.js

Index: Source/devtools/front_end/timeline/TimelineFrameModel.js
diff --git a/Source/devtools/front_end/timeline/TimelineFrameModel.js b/Source/devtools/front_end/timeline/TimelineFrameModel.js
index 2c40103164a0deb11b3ed852bcb406faf2fdb2c4..5701e1b85599248058cacd8f82f1ed929183a1b5 100644
--- a/Source/devtools/front_end/timeline/TimelineFrameModel.js
+++ b/Source/devtools/front_end/timeline/TimelineFrameModel.js
@@ -38,6 +38,13 @@ WebInspector.TimelineFrameModelBase = function()
 
 WebInspector.TimelineFrameModelBase.prototype = {
     /**
+     * @param {boolean} value
+     */
+    setMergeRecords: function(value)
+    {
+    },
+
+    /**
      * @return {!Array.<!WebInspector.TimelineFrame>}
      */
     frames: function()