TimelinePanel: REGRESSION fix for search in timeline panel

Source/devtools/front_end/TimelinePanel.js

Index: Source/devtools/front_end/TimelinePanel.js
diff --git a/Source/devtools/front_end/TimelinePanel.js b/Source/devtools/front_end/TimelinePanel.js
index 71fc05530a74916ff0cbe9bed06a2411dbc277d4..ffb690dec1a3a98f7fbb8ac588d1dba2b57e20d7 100644
--- a/Source/devtools/front_end/TimelinePanel.js
+++ b/Source/devtools/front_end/TimelinePanel.js
@@ -795,7 +795,7 @@ WebInspector.TimelinePanel.prototype = {
      */
     _updateSearchHighlight: function(revealRecord, shouldJump, jumpBackwards)
     {
-        if (this._textFilter || !this._searchRegex) {
+        if (!this._textFilter.isEmpty() || !this._searchRegex) {
             this._clearHighlight();
             return;
         }
@@ -1160,6 +1160,14 @@ WebInspector.TimelineTextFilter = function()
 
 WebInspector.TimelineTextFilter.prototype = {
     /**
+     * @return {boolean}
+     */
+    isEmpty: function()
+    {
+        return !this._regex;
+    },
+
+    /**
      * @param {?RegExp} regex
      */
     setRegex: function(regex)