Revert "Collect the types used in is-checks in the resolver phase."

lib/compiler/implementation/universe.dart

Index: lib/compiler/implementation/universe.dart
diff --git a/lib/compiler/implementation/universe.dart b/lib/compiler/implementation/universe.dart
index f6eefe1047c79e134200ca9ee137ee874162b7f4..af79f574212eebe0905491d232372e16aa4ef077 100644
--- a/lib/compiler/implementation/universe.dart
+++ b/lib/compiler/implementation/universe.dart
@@ -12,9 +12,8 @@ class Universe {
   final Map<SourceString, Set<Selector>> invokedSetters;
   final Map<SourceString, Set<Selector>> fieldGetters;
   final Map<SourceString, Set<Selector>> fieldSetters;
-  final Set<DartType> isChecks;
-  // TODO(karlklose): move this data to RuntimeTypeInformation.
-  Set<Element> checkedClasses;
+  // TODO(ngeoffray): This should be a Set<DartType>.
+  final Set<Element> isChecks;
   final RuntimeTypeInformation rti;
 
   Universe() : generatedCode = new Map<Element, CodeBuffer>(),
@@ -26,16 +25,9 @@ class Universe {
                invokedSetters = new Map<SourceString, Set<Selector>>(),
                fieldGetters = new Map<SourceString, Set<Selector>>(),
                fieldSetters = new Map<SourceString, Set<Selector>>(),
-               isChecks = new Set<DartType>(),
+               isChecks = new Set<Element>(),
                rti = new RuntimeTypeInformation();
 
-  // TODO(karlklose): add the set of instantiatedtypes as second argument.
-  void computeRequiredTypes(Set<DartType> isChecks) {
-    assert(checkedClasses == null);
-    checkedClasses = new Set<Element>();
-    isChecks.forEach((DartType t) => checkedClasses.add(t.element));
-  }
-
   void addGeneratedCode(WorkItem work, CodeBuffer codeBuffer) {
     generatedCode[work.element] = codeBuffer;
   }