Update the <canvas> IDLs wrt 'unrestricted'

Source/core/html/canvas/CanvasPathMethods.idl

 // Copyright 2014 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.
 
 // http://www.whatwg.org/specs/web-apps/current-work/multipage/the-canvas-element.html#canvaspathmethods
 
 [
     NoInterfaceObject, // Always used on target of 'implements'
 ] interface CanvasPathMethods {
     // shared path API methods
     void closePath();
-    void moveTo(float x, float y);
-    void lineTo(float x, float y);
-    void quadraticCurveTo(float cpx, float cpy, float x, float y);
-    void bezierCurveTo(float cp1x, float cp1y, float cp2x, float cp2y, float x, float y);
-    [RaisesException] void arcTo(float x1, float y1, float x2, float y2, float radius);
-    void rect(float x, float y, float width, float height);
-    [RaisesException] void arc(float x, float y, float radius, float startAngle, float endAngle, [Default=Undefined] optional boolean anticlockwise);
-    [RaisesException] void ellipse(float x, float y, float radiusX, float radiusY, float rotation, float startAngle, float endAngle, [Default=Undefined] optional boolean anticlockwise);
+    void moveTo(unrestricted float x, unrestricted float y);
+    void lineTo(unrestricted float x, unrestricted float y);
+    void quadraticCurveTo(unrestricted float cpx, unrestricted float cpy, unrestricted float x, unrestricted float y);
+    void bezierCurveTo(unrestricted float cp1x, unrestricted float cp1y, unrestricted float cp2x, unrestricted float cp2y, unrestricted float x, unrestricted float y);
+    [RaisesException] void arcTo(unrestricted float x1, unrestricted float y1, unrestricted float x2, unrestricted float y2, unrestricted float radius);
+    void rect(unrestricted float x, unrestricted float y, unrestricted float width, unrestricted float height);
+    [RaisesException] void arc(unrestricted float x, unrestricted float y, unrestricted float radius, unrestricted float startAngle, unrestricted float endAngle, [Default=Undefined] optional boolean anticlockwise);
+    [RaisesException] void ellipse(unrestricted float x, unrestricted float y, unrestricted float radiusX, unrestricted float radiusY, unrestricted float rotation, unrestricted float startAngle, unrestricted float endAngle, [Default=Undefined] optional boolean anticlockwise);
 };