Remove ElementEnvironment.getCallStructure

pkg/compiler/lib/src/js_backend/resolution_listener.dart

Index: pkg/compiler/lib/src/js_backend/resolution_listener.dart
diff --git a/pkg/compiler/lib/src/js_backend/resolution_listener.dart b/pkg/compiler/lib/src/js_backend/resolution_listener.dart
index af08ceb09f0406da16425f04c5134988776a90f6..b009d63ff1acea45dbb393acfb5ddd578ff390fe 100644
--- a/pkg/compiler/lib/src/js_backend/resolution_listener.dart
+++ b/pkg/compiler/lib/src/js_backend/resolution_listener.dart
@@ -152,8 +152,11 @@ class ResolutionEnqueuerListener extends EnqueuerListener {
   /// Computes the [WorldImpact] of calling [mainMethod] as the entry point.
   WorldImpact _computeMainImpact(FunctionEntity mainMethod) {
     WorldImpactBuilderImpl mainImpact = new WorldImpactBuilderImpl();
-    CallStructure callStructure =
-        _elementEnvironment.getCallStructure(mainMethod);
+    ParameterStructure parameterStructure = mainMethod.parameterStructure;
+    CallStructure callStructure = new CallStructure(
+        parameterStructure.positionalParameters +
+            parameterStructure.namedParameters.length,
+        parameterStructure.namedParameters);
     if (callStructure.argumentCount > 0) {
       _impacts.mainWithArguments
           .registerImpact(mainImpact, _elementEnvironment);