1985 no longer supports webkitBackingStorePixelRatio on CanvasRenderingContext2D

tools/dom/templates/html/impl/impl_CanvasRenderingContext2D.darttemplate

 // Copyright (c) 2012, 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.
 
 part of $LIBRARYNAME;
 
 $(ANNOTATIONS)$(CLASS_MODIFIERS)class $CLASSNAME$EXTENDS$IMPLEMENTS$NATIVESPEC {
 $!MEMBERS
 
   /**
@@ skipping 330 matching lines @@
     } else {
       JS('void', '#.fillText(#, #, #)', this, text, x, y);
     }
   }
 
   @DomName('CanvasRenderingContext2D.fill')
   void fill([String winding = 'nonzero']) {
     JS('void', '#.fill(#)', this, winding);
   }
 $endif
+
+  /** Deprecated always returns 1.0 */
+  @DomName('CanvasRenderingContext2D.webkitBackingStorePixelRation')
+  @Experimental()
+  @deprecated
+  double get backingStorePixelRatio => 1.0;
 }