[turbofan] Minor cleanup to reduce code duplication.

test/unittests/compiler/js-typed-lowering-unittest.cc

Index: test/unittests/compiler/js-typed-lowering-unittest.cc
diff --git a/test/unittests/compiler/js-typed-lowering-unittest.cc b/test/unittests/compiler/js-typed-lowering-unittest.cc
index 883683d236cdfaa1f9e9464eef258973c3d46e6e..e4ea4a581f6b3e937ed8cbd8fa5043db5749d2ae 100644
--- a/test/unittests/compiler/js-typed-lowering-unittest.cc
+++ b/test/unittests/compiler/js-typed-lowering-unittest.cc
@@ -50,12 +50,6 @@ class JSTypedLoweringTest : public TypedGraphTest {
     return reducer.Reduce(node);
   }
 
-  Node* Parameter(Type* type, int index = 0) {
-    Node* node = graph()->NewNode(common()->Parameter(index), graph()->start());
-    NodeProperties::SetBounds(node, Bounds(Type::None(), type));
-    return node;
-  }
-
   Handle<JSArrayBuffer> NewArrayBuffer(void* bytes, size_t byte_length) {
     Handle<JSArrayBuffer> buffer = factory()->NewJSArrayBuffer();
     Runtime::SetupArrayBuffer(isolate(), buffer, true, bytes, byte_length);