Get rid of returnTypeOfElement (abstract) and typeOfElementWithSelector (concrete method assuming t…

sdk/lib/_internal/compiler/implementation/types/type_graph_inferrer.dart

Index: sdk/lib/_internal/compiler/implementation/types/type_graph_inferrer.dart
diff --git a/sdk/lib/_internal/compiler/implementation/types/type_graph_inferrer.dart b/sdk/lib/_internal/compiler/implementation/types/type_graph_inferrer.dart
index 10d96a077bf5bf67ed14b77976f40895fa7d32e6..d401382b812ad0b965c695f0525aa883adb93a91 100644
--- a/sdk/lib/_internal/compiler/implementation/types/type_graph_inferrer.dart
+++ b/sdk/lib/_internal/compiler/implementation/types/type_graph_inferrer.dart
@@ -61,7 +61,7 @@ abstract class TypeInformation {
   TypeInformation(this.type, [users, assignments])
       : users = (users == null) ? new Set<TypeInformation>() : users,
         assignments = (assignments == null) ? <TypeInformation>[] : assignments;
-      
+
 
   void addUser(TypeInformation user) {
     assert(!user.isConcrete);
@@ -172,7 +172,7 @@ class ParameterAssignments extends IterableBase<TypeInformation> {
  * - Native functions and fields: because native methods contain no Dart
  *   code, and native fields do not have Dart assignments, we just
  *   trust their type annotation.
- *   
+ *
  */
 class ElementTypeInformation extends TypeInformation {
   final Element element;
@@ -468,7 +468,7 @@ class DynamicCallSiteTypeInformation extends CallSiteTypeInformation {
         inferrer.updateParameterAssignments(
             this, element, arguments, typedSelector, remove: false);
       }
-      
+
       if (receiver.type.isContainer && selector.isIndex()) {
         // Find the [ElementInContainerTypeInformation] node and tell
         // that this node is a user of it. Later, when the element
@@ -970,7 +970,7 @@ class WorkQueue {
  *
  */
 class TypeGraphInferrerEngine
-    extends InferrerEngine<TypeInformation, TypeInformationSystem> {
+    extends SimpleInferrerEngine<TypeInformation, TypeInformationSystem> {
   final Map<Element, ConcreteTypeInformation> defaultTypeOfParameter =
       new Map<Element, ConcreteTypeInformation>();
   final WorkQueue workQueue = new WorkQueue();