Revert "Add support for the new function-type syntax."

pkg/compiler/lib/src/ssa/graph_builder.dart

Index: pkg/compiler/lib/src/ssa/graph_builder.dart
diff --git a/pkg/compiler/lib/src/ssa/graph_builder.dart b/pkg/compiler/lib/src/ssa/graph_builder.dart
index 0af3064f171e78fae6d45512ef6b4488362f9302..9dbab93421640ec2713f90398f7eea72b0ad5d65 100644
--- a/pkg/compiler/lib/src/ssa/graph_builder.dart
+++ b/pkg/compiler/lib/src/ssa/graph_builder.dart
@@ -261,14 +261,6 @@ class ReifiedTypeRepresentationBuilder
       ResolutionTypeVariableType type, GraphBuilder builder) {
     ClassElement cls = builder.backend.helpers.RuntimeType;
     TypeMask instructionType = new TypeMask.subclass(cls, closedWorld);
-
-    // TODO(floitsch): this hack maps type variables of generic function
-    // typedefs to dynamic. For example: `typedef F = Function<T>(T)`.
-    if (type is MethodTypeVariableType) {
-      visitDynamicType(const ResolutionDynamicType(), builder);
-      return;
-    }
-
     if (!builder.sourceElement.enclosingElement.isClosure &&
         builder.sourceElement.isInstanceMember) {
       HInstruction receiver = builder.localsHandler.readThis();