Revert "Parts must start with 'part of'" and "Attempt to fix VM build"

dart/samples/ui_lib/touch/Geometry.dart

-part of touch;
-
 // 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 {
 
   /**
@@ skipping 71 matching lines @@
   }
 
   bool contains(num value) {
     return value >= start && value < end;
   }
 
   String toString() {
     return '(${start}, ${end})';
   }
 }