cc: Remove the lie of "DirectRenderer" in LayerTreeTests.

cc/test/layer_tree_test.cc

Index: cc/test/layer_tree_test.cc
diff --git a/cc/test/layer_tree_test.cc b/cc/test/layer_tree_test.cc
index 8947789ca2f11768264bdb9ebfee68337bd5d0ab..86bb2e0a75efd304abdbd557b76a664b34f1bfb9 100644
--- a/cc/test/layer_tree_test.cc
+++ b/cc/test/layer_tree_test.cc
@@ -787,7 +787,7 @@ void LayerTreeTest::DispatchNextCommitWaitsForActivation() {
     layer_tree_host_->SetNextCommitWaitsForActivation();
 }
 
-void LayerTreeTest::RunTest(CompositorMode mode, bool delegating_renderer) {
+void LayerTreeTest::RunTest(CompositorMode mode) {
   mode_ = mode;
   if (mode_ == CompositorMode::THREADED || mode_ == CompositorMode::REMOTE) {
     impl_thread_.reset(new base::Thread("Compositor"));
@@ -798,8 +798,6 @@ void LayerTreeTest::RunTest(CompositorMode mode, bool delegating_renderer) {
   gpu_memory_buffer_manager_.reset(new TestGpuMemoryBufferManager);
   task_graph_runner_.reset(new TestTaskGraphRunner);
 
-  delegating_renderer_ = delegating_renderer;
-
   // Spend less time waiting for BeginFrame because the output is
   // mocked out.
   settings_.renderer_settings.refresh_rate = 200.0;