Removed DARTIUM codegen for IDLS (sdk/lib/dartium)

tools/dom/templates/html/impl/impl_MutationObserver.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;
 
 $(ANNOTATIONS)$(NATIVESPEC)$(CLASS_MODIFIERS)class $CLASSNAME$EXTENDS$IMPLEMENTS {
 $!MEMBERS
   /**
    * Checks to see if the mutation observer API is supported on the current
    * platform.
    */
   static bool get supported {
-$if DARTIUM
-    return true;
-$else
     return JS('bool',
         '!!(window.MutationObserver || window.WebKitMutationObserver)');
-$endif
   }
-$if DARTIUM
-  @DocsEditable()
-  static MutationObserver _create(callback) => _blink.BlinkMutationObserver.instance.constructorCallback_1_(callback);
-$endif
 
   /**
    * Observes the target for the specified changes.
    *
    * Some requirements for the optional parameters:
    *
    * * Either childList, attributes or characterData must be true.
    * * If attributeOldValue is true then attributes must also be true.
    * * If attributeFilter is specified then attributes must be true.
    * * If characterDataOldValue is true then characterData must be true.
@@ skipping 30 matching lines @@
 
    // TODO: Change to a set when const Sets are available.
   static final _boolKeys =
     const {'childList': true,
            'attributes': true,
            'characterData': true,
            'subtree': true,
            'attributeOldValue': true,
            'characterDataOldValue': true };
 
-$if DARTIUM
-  static _createDict() => {};
-  static _add(m, String key, value) { m[key] = value; }
-  static _fixupList(list) => list;
 
-  void _call(Node target, options) {
-    _observe(target, options);
-  }
-$endif
-
-$if DART2JS
   static _createDict() => JS('var', '{}');
   static _add(m, String key, value) { JS('void', '#[#] = #', m, key, value); }
   static _fixupList(list) => list;  // TODO: Ensure is a JavaScript Array.
 
   // Call native function with no conversions.
   @JSName('observe')
   void _call(target, options) native;
 
   factory MutationObserver(MutationCallback callback) {
     // Dummy statement to mark types as instantiated.
     JS('MutationObserver|MutationRecord', '0');
 
     return JS('MutationObserver',
         'new(window.MutationObserver||window.WebKitMutationObserver||'
         'window.MozMutationObserver)(#)',
         convertDartClosureToJS(_wrapBinaryZone(callback), 2));
   }
-$else
-  factory MutationObserver(MutationCallback callback) =>
-      new MutationObserver._(_wrapBinaryZone(callback));
-$endif
 }