DevTools: replace mouseout with mouseleave where possible.

Source/devtools/front_end/timeline/CountersGraph.js

Index: Source/devtools/front_end/timeline/CountersGraph.js
diff --git a/Source/devtools/front_end/timeline/CountersGraph.js b/Source/devtools/front_end/timeline/CountersGraph.js
index 8e4edbca78dee2cbf8eab367fe21416ba57927ac..5b039c599214697a715568fcfd3f5bb69cffecba 100644
--- a/Source/devtools/front_end/timeline/CountersGraph.js
+++ b/Source/devtools/front_end/timeline/CountersGraph.js
@@ -56,7 +56,7 @@ WebInspector.CountersGraph = function(title, delegate, model)
 
     this._canvasContainer.addEventListener("mouseover", this._onMouseMove.bind(this), true);
     this._canvasContainer.addEventListener("mousemove", this._onMouseMove.bind(this), true);
-    this._canvasContainer.addEventListener("mouseout", this._onMouseOut.bind(this), true);
+    this._canvasContainer.addEventListener("mouseleave", this._onMouseLeave.bind(this), true);
     this._canvasContainer.addEventListener("click", this._onClick.bind(this), true);
     // We create extra timeline grid here to reuse its event dividers.
     this._timelineGrid = new WebInspector.TimelineGrid();
@@ -201,7 +201,7 @@ WebInspector.CountersGraph.prototype = {
     /**
      * @param {!Event} event
      */
-    _onMouseOut: function(event)
+    _onMouseLeave: function(event)
     {
         delete this._markerXPosition;
         this._clearCurrentValueAndMarker();