Revert "dart2js: remove invalid case in generateParameterStubStatements in NativeEmitter."

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

Index: pkg/compiler/lib/src/js_emitter/native_emitter.dart
diff --git a/pkg/compiler/lib/src/js_emitter/native_emitter.dart b/pkg/compiler/lib/src/js_emitter/native_emitter.dart
index d4e1fe434be0f4fa0c66269f7a63de1297d0f1c8..ecde8235c070742f62bd75f0c2f30579c1b7e16b 100644
--- a/pkg/compiler/lib/src/js_emitter/native_emitter.dart
+++ b/pkg/compiler/lib/src/js_emitter/native_emitter.dart
@@ -333,10 +333,17 @@ class NativeEmitter {
     // arguments up until the last one provided.
     target = member.fixedBackendName;
 
-    assert(invariant(member, isInterceptedMethod));
-    receiver = argumentsBuffer[0];
-    arguments = argumentsBuffer.sublist(1,
-        indexOfLastOptionalArgumentInParameters + 1);
+    if (isInterceptedMethod) {
+      receiver = argumentsBuffer[0];
+      arguments = argumentsBuffer.sublist(1,
+          indexOfLastOptionalArgumentInParameters + 1);
+    } else {
+      // Native methods that are not intercepted must be static.
+      assert(invariant(member, member.isStatic));
+      receiver = js('this');
+      arguments = argumentsBuffer.sublist(0,
+          indexOfLastOptionalArgumentInParameters + 1);
+    }
     statements.add(
         js.statement('return #.#(#)', [receiver, target, arguments]));