Fix hints reported by analyzer.

pkg/compiler/lib/src/inferrer/builder.dart

 // Copyright (c) 2013, 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.
 
 library simple_types_inferrer;
 
 import '../closure.dart' show ClosureClassMap;
 import '../common.dart';
 import '../common/names.dart' show Identifiers, Selectors;
 import '../compiler.dart' show Compiler;
@@ skipping 1194 matching lines @@
   bool get inInstanceContext {
     return (outermostElement.isInstanceMember && !outermostElement.isField) ||
         outermostElement.isGenerativeConstructor;
   }
 
   bool treatAsInstanceMember(Element element) {
     return (Elements.isUnresolved(element) && inInstanceContext) ||
         (element != null && element.isInstanceMember);
   }
 
-  @override
   TypeInformation handleSendSet(ast.SendSet node) {
     Element element = elements[node];
     if (!Elements.isUnresolved(element) && element.impliesType) {
       node.visitChildren(this);
       return types.dynamicType;
     }
 
     Selector getterSelector = elements.getGetterSelectorInComplexSendSet(node);
     TypeMask getterMask = inTreeData.typeOfGetter(node);
     TypeMask operatorMask = inTreeData.typeOfOperator(node);
@@ skipping 1044 matching lines @@
       }
     }
     return null;
   }
 
   TypeInformation visitAwait(ast.Await node) {
     TypeInformation futureType = node.expression.accept(this);
     return inferrer.registerAwait(node, futureType);
   }
 
-  @override
   TypeInformation handleTypeLiteralInvoke(ast.NodeList arguments) {
     // This is reached when users forget to put a `new` in front of a type
     // literal. The emitter will generate an actual call (even though it is
     // likely invalid), and for that it needs to have the arguments processed
     // as well.
     analyzeArguments(arguments.nodes);
     return types.dynamicType;
   }
 
   /// Handle constructor invocation of [constructor].
@@ skipping 639 matching lines @@
     Selector moveNextSelector = Selectors.moveNext;
     TypeMask moveNextMask = inTreeData.typeOfIteratorMoveNext(node);
 
     TypeInformation iteratorType = handleDynamicSend(node, iteratorSelector,
         iteratorMask, expressionType, new ArgumentsTypes.empty());
 
     return handleForInLoop(node, iteratorType, currentSelector, currentMask,
         moveNextSelector, moveNextMask);
   }
 }