dart2js: Fix hints in code base.

pkg/compiler/lib/src/resolution/members.dart

Index: pkg/compiler/lib/src/resolution/members.dart
diff --git a/pkg/compiler/lib/src/resolution/members.dart b/pkg/compiler/lib/src/resolution/members.dart
index 27dda38d8150b044756529368e0c2db331daabea..a8ff69cc57fc045fa0ee8f602e8958935a773770 100644
--- a/pkg/compiler/lib/src/resolution/members.dart
+++ b/pkg/compiler/lib/src/resolution/members.dart
@@ -1972,7 +1972,6 @@ class ResolverVisitor extends MappingVisitor<ResolutionResult> {
       registerPotentialAccessInClosure(node, target);
     }
 
-    bool resolvedArguments = false;
     resolveArguments(node.argumentsNode);
 
     // If the selector is null, it means that we will not be generating
@@ -2467,7 +2466,6 @@ class ResolverVisitor extends MappingVisitor<ResolutionResult> {
   }
 
   ResolutionResult visitNewExpression(NewExpression node) {
-    Node selector = node.send.selector;
     FunctionElement constructor = resolveConstructor(node);
     final bool isSymbolConstructor = constructor == compiler.symbolConstructor;
     final bool isMirrorsUsedConstant =