Revert "This change makes it easier to put type parameters on JavaScript Arrays."

sdk/lib/_internal/compiler/implementation/js_backend/backend.dart

 // 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 js_backend;
 
 const VERBOSE_OPTIMIZER_HINTS = false;
 
 class JavaScriptItemCompilationContext extends ItemCompilationContext {
   final Set<HInstruction> boundsChecked = new Set<HInstruction>();
@@ skipping 177 matching lines @@
   ClassElement jsUnknownJavaScriptObjectClass;
 
   ClassElement jsIndexableClass;
   ClassElement jsMutableIndexableClass;
 
   ClassElement jsMutableArrayClass;
   ClassElement jsFixedArrayClass;
   ClassElement jsExtendableArrayClass;
 
   Element jsIndexableLength;
-  Element jsArrayTypedConstructor;
   Element jsArrayRemoveLast;
   Element jsArrayAdd;
   Element jsStringSplit;
   Element jsStringToString;
   Element jsStringOperatorAdd;
   Element objectEquals;
 
   ClassElement typeLiteralClass;
   ClassElement mapLiteralClass;
   ClassElement constMapLiteralClass;
@@ skipping 401 matching lines @@
 
     jsIndexableClass.ensureResolved(compiler);
     jsIndexableLength = compiler.lookupElementIn(
         jsIndexableClass, 'length');
     if (jsIndexableLength != null && jsIndexableLength.isAbstractField()) {
       AbstractFieldElement element = jsIndexableLength;
       jsIndexableLength = element.getter;
     }
 
     jsArrayClass.ensureResolved(compiler);
-    jsArrayTypedConstructor = compiler.lookupElementIn(jsArrayClass, 'typed');
     jsArrayRemoveLast = compiler.lookupElementIn(jsArrayClass, 'removeLast');
     jsArrayAdd = compiler.lookupElementIn(jsArrayClass, 'add');
 
     jsStringClass.ensureResolved(compiler);
     jsStringSplit = compiler.lookupElementIn(jsStringClass, 'split');
     jsStringOperatorAdd = compiler.lookupElementIn(jsStringClass, '+');
     jsStringToString = compiler.lookupElementIn(jsStringClass, 'toString');
 
     typeLiteralClass = compiler.findHelper('TypeImpl');
     mapLiteralClass = compiler.coreLibrary.find('LinkedHashMap');
@@ skipping 1348 matching lines @@
     copy(constant.values);
     copy(constant.protoValue);
     copy(constant);
   }
 
   void visitConstructed(ConstructedConstant constant) {
     copy(constant.fields);
     copy(constant);
   }
 }