chore: analyzer fixes for Dart transformer

Author: kevmoo

modules/angular2/src/transform/directive_processor/transformer.dart

@@ -2,7 +2,6 @@ library angular2.transform.directive_processor.transformer;
 
 import 'dart:async';
 
-import 'package:angular2/src/transform/common/formatter.dart';
 import 'package:angular2/src/transform/common/logging.dart' as log;
 import 'package:angular2/src/transform/common/names.dart';
 import 'package:angular2/src/transform/common/options.dart';

modules/angular2/src/transform/reflection_remover/codegen.dart

@@ -77,7 +77,7 @@ class _ReflectorVisitor extends Object with SimpleAstVisitor<Expression> {
 
   @override
   Expression visitPropertyAccess(PropertyAccess node) {
-    if (node == null || node.target == null) return;
+    if (node == null || node.target == null) return null;
     return node.target;
   }
 

modules/angular2/src/transform/template_compiler/generator.dart

@@ -160,15 +160,15 @@ class _TemplateExtractVisitor extends Object with RecursiveAstVisitor<Object> {
     // TODO(kegluneq): Remove this limitation.
     if (node.name is! Label || node.name.label is! SimpleIdentifier) {
       logger.error(
-          'Angular 2 currently only supports simple identifiers in directives',
+          'Angular 2 currently only supports simple identifiers in directives.'
           ' Source: ${node}');
       return null;
     }
     var keyString = '${node.name.label}';
     if (keyString == 'inline' || keyString == 'url') {
       if (node.expression is! SimpleStringLiteral) {
         logger.error(
-            'Angular 2 currently only supports string literals in directives',
+            'Angular 2 currently only supports string literals in directives.'
             ' Source: ${node}');
         return null;
       }

modules/angular2/src/transform/template_compiler/recording_reflection_capabilities.dart

@@ -8,26 +8,20 @@ import 'package:angular2/src/reflection/types.dart';
 /// reflectively accessed at runtime.
 class RecordingReflectionCapabilities implements ReflectionCapabilities {
   /// The names of all requested `getter`s.
-  final List<String> getterNames = [];
+  final List<String> getterNames = <String>[];
   /// The names of all requested `setter`s.
-  final List<String> setterNames = [];
+  final List<String> setterNames = <String>[];
   /// The names of all requested `method`s.
-  final List<String> methodNames = [];
+  final List<String> methodNames = <String>[];
 
-  void _notImplemented(String name) {
-    throw 'Not implemented: $name';
-  }
+  _notImplemented(String name) => throw 'Not implemented: $name';
 
   Function factory(Type type) => _notImplemented('factory');
 
   List<List> parameters(typeOrFunc) => _notImplemented('parameters');
 
   List annotations(typeOrFunc) => _notImplemented('annotations');
 
-  static GetterFn _nullGetter = (Object p) => null;
-  static SetterFn _nullSetter = (Object p, v) => null;
-  static MethodFn _nullMethod = (Object p, List a) => null;
-
   GetterFn getter(String name) {
     getterNames.add(name);
     return _nullGetter;
@@ -43,3 +37,7 @@ class RecordingReflectionCapabilities implements ReflectionCapabilities {
     return _nullMethod;
   }
 }
+
+_nullGetter(Object p) => null;
+_nullSetter(Object p, v) => null;
+_nullMethod(Object p, List a) => null;