Resolve obvious deprecation warnings on bleeding edge

lib/src/utils.dart

Index: lib/src/utils.dart
diff --git a/lib/src/utils.dart b/lib/src/utils.dart
index 15b06aac0c6bea4588ef64936489e754e87ce146..a5c08808ecedc5f7104baa99c66962fbdef91828 100644
--- a/lib/src/utils.dart
+++ b/lib/src/utils.dart
@@ -6,7 +6,7 @@
 
 import 'dart:io';
 import 'package:path/path.dart' as path;
-import 'package:analyzer/src/generated/ast.dart'
+import 'package:analyzer/dart/ast/ast.dart'
     show
         ImportDirective,
         ExportDirective,
@@ -18,8 +18,12 @@ import 'package:analyzer/src/generated/ast.dart'
         Expression,
         SimpleIdentifier,
         MethodInvocation;
+import 'package:analyzer/dart/element/element.dart';
+import 'package:analyzer/dart/element/type.dart';
 import 'package:analyzer/src/generated/constant.dart' show DartObject;
-import 'package:analyzer/src/generated/element.dart';
+//TODO(leafp): Remove deprecated dependency
+//ignore: DEPRECATED_MEMBER_USE

[Jennifer Messerly, 2016/03/14 23:12:42]

oh, I was confused because it didn't look deprecated:
https://github.com/dart-lang/sdk/blob/3a8bc819451290e1763ab46626809d1c469c8da...

I guess you're saying it's non-public. Yeah, it seems good to move off the
non-public APIs if possible

[Leaf, 2016/03/14 23:58:42]

src/generated/element.dart is deprecated.  I can move us over to
src/dart/element/element.dart, and will do so if we decide we want to keep
reaching in, but I wanted to first call out the places where we are reaching our
tendrils into the analyzer internals.

+import 'package:analyzer/src/generated/element.dart' show DynamicTypeImpl;
 import 'package:analyzer/src/generated/engine.dart' show AnalysisContext;
 import 'package:analyzer/src/generated/error.dart' show ErrorCode;
 import 'package:analyzer/src/task/dart.dart' show ParseDartTask;