CC Animation: Unify ElementId in Blink Compositor Worker.

cc/layers/layer_unittest.cc

Index: cc/layers/layer_unittest.cc
diff --git a/cc/layers/layer_unittest.cc b/cc/layers/layer_unittest.cc
index dd5bc1515b4d2cbae5cbfd07409dc366184f26c5..17de23e8c2395d0e45ff15e65de09dc53a9c9890 100644
--- a/cc/layers/layer_unittest.cc
+++ b/cc/layers/layer_unittest.cc
@@ -2491,12 +2491,12 @@ TEST_F(LayerTest, ElementIdAndMutablePropertiesArePushed) {
   test_layer->SetElementId(2);
   test_layer->SetMutableProperties(MutableProperty::kTransform);
 
-  EXPECT_EQ(0lu, impl_layer->element_id());
+  EXPECT_EQ(0, impl_layer->element_id());
   EXPECT_EQ(MutableProperty::kNone, impl_layer->mutable_properties());
 
   test_layer->PushPropertiesTo(impl_layer.get());
 
-  EXPECT_EQ(2lu, impl_layer->element_id());
+  EXPECT_EQ(2, impl_layer->element_id());
   EXPECT_EQ(MutableProperty::kTransform, impl_layer->mutable_properties());
 }