Remove HRuntimeType implementation

pkg/compiler/lib/src/js_emitter/code_emitter_task.dart

Index: pkg/compiler/lib/src/js_emitter/code_emitter_task.dart
diff --git a/pkg/compiler/lib/src/js_emitter/code_emitter_task.dart b/pkg/compiler/lib/src/js_emitter/code_emitter_task.dart
index 430f1de3caf2941bd0c1257d331b5c453beb1a3c..cb69608cf8ba3ccc35204bc3479f9573b996ebbe 100644
--- a/pkg/compiler/lib/src/js_emitter/code_emitter_task.dart
+++ b/pkg/compiler/lib/src/js_emitter/code_emitter_task.dart
@@ -40,10 +40,6 @@ class CodeEmitterTask extends CompilerTask {
   Emitter _emitter;
   final Compiler compiler;
 
-  /// Records if a type variable is read dynamically for type tests.
-  final Set<TypeVariableEntity> readTypeVariables =
-      new Set<TypeVariableEntity>();
-
   JavaScriptBackend get backend => compiler.backend;
 
   @deprecated
@@ -151,10 +147,6 @@ class CodeEmitterTask extends CompilerTask {
     return emitter.templateForBuiltin(builtin);
   }
 
-  void registerReadTypeVariable(TypeVariableEntity element) {
-    readTypeVariables.add(element);
-  }
-
   Set<ClassEntity> _finalizeRti() {
     // Compute the required type checks to know which classes need a
     // 'is$' method.