Revert initializing formals change in client code

client/touch/Geometry.dart

 // Copyright (c) 2011, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 /**
  * Represents a point in 2 dimensional space.
  */
 class Coordinate {
 
   /**
    * X-value
    */
   num x;
 
   /**
    * Y-value
    */
   num y;
 
-  Coordinate([num x = 0, num y = 0]) : this.x = x, this.y = y {
+  Coordinate([num this.x = 0, num this.y = 0]) {
   }
 
   /**
    * Gets the coordinates of a touch's location relative to the window's
    * viewport. [input] is either a touch object or an event object.
    */
   Coordinate.fromClient(var input) : this(input.clientX, input.clientY);
 
   static Coordinate difference(Coordinate a, Coordinate b) {
     return new Coordinate(a.x - b.x, a.y - b.y);
@@ skipping 51 matching lines @@
   }
 
   bool contains(num value) {
     return value >= start && value < end;
   }
 
   String toString() {
     return '(${start}, ${end})';
   }
 }