Canvas2d: Remove unnecessary conversion in EventHitRegion.

Source/modules/canvas2d/EventHitRegion.cpp

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "config.h"
 #include "modules/canvas2d/EventHitRegion.h"
 
 #include "core/dom/Document.h"
 #include "core/html/HTMLCanvasElement.h"
 #include "core/layout/LayoutObject.h"
 #include "modules/canvas2d/CanvasRenderingContext2D.h"
 #include "modules/canvas2d/HitRegion.h"
 
 namespace blink {
 
 String EventHitRegion::regionIdFromAbsoluteLocation(HTMLCanvasElement& canvas, const LayoutPoint& location)
 {
     CanvasRenderingContext* context = canvas.renderingContext();
     if (!context || !context->is2d())
         return String();
 
     Document& document = canvas.document();
     document.updateLayoutTreeForNodeIfNeeded(&canvas);
 
     // Adjust offsetLocation to be relative to the canvas's position.
     LayoutObject* layoutObject = canvas.layoutObject();
     FloatPoint localPos = layoutObject->absoluteToLocal(FloatPoint(location), UseTransforms);
-    LayoutPoint localLayoutPoint = roundedLayoutPoint(localPos);
 
     LocalFrame* frame = document.frame();
     float zoomFactor = frame ? frame->pageZoomFactor() : 1;
     float scaleFactor = 1 / zoomFactor;
     if (scaleFactor != 1.0f)
-        localLayoutPoint.scale(scaleFactor, scaleFactor);
+        localPos.scale(scaleFactor, scaleFactor);
 
-    HitRegion* hitRegion = toCanvasRenderingContext2D(context)->hitRegionAtPoint(localLayoutPoint);
+    HitRegion* hitRegion = toCanvasRenderingContext2D(context)->hitRegionAtPoint(localPos);
     if (!hitRegion || hitRegion->id().isEmpty())
         return String();
 
     return hitRegion->id();
 }
 
 } // namespace blink