ui: Cleanup class/struct forward declarations

cc/debug/micro_benchmark_controller_unittest.cc

Index: cc/debug/micro_benchmark_controller_unittest.cc
diff --git a/cc/debug/micro_benchmark_controller_unittest.cc b/cc/debug/micro_benchmark_controller_unittest.cc
index e5a716fd59066b06555a3b25158e05f8651da90b..4a6ce7e50ee057dfc27df2f391f18046bff68aa9 100644
--- a/cc/debug/micro_benchmark_controller_unittest.cc
+++ b/cc/debug/micro_benchmark_controller_unittest.cc
@@ -9,6 +9,7 @@
 #include "base/callback.h"
 #include "base/memory/ptr_util.h"
 #include "base/run_loop.h"
+#include "cc/animation/animation_host.h"
 #include "cc/debug/micro_benchmark.h"
 #include "cc/layers/layer.h"
 #include "cc/test/fake_impl_task_runner_provider.h"
@@ -29,8 +30,9 @@ class MicroBenchmarkControllerTest : public testing::Test {
     layer_tree_host_impl_ = base::MakeUnique<FakeLayerTreeHostImpl>(
         impl_task_runner_provider_.get(), &task_graph_runner_);
 
-    layer_tree_host_ = FakeLayerTreeHost::Create(&layer_tree_host_client_,
-                                                 &task_graph_runner_);
+    animation_host_ = AnimationHost::CreateForTesting(ThreadInstance::MAIN);
+    layer_tree_host_ = FakeLayerTreeHost::Create(
+        &layer_tree_host_client_, &task_graph_runner_, animation_host_.get());
     layer_tree_host_->SetRootLayer(Layer::Create());
     layer_tree_host_->InitializeForTesting(
         TaskRunnerProvider::Create(nullptr, nullptr),
@@ -41,10 +43,12 @@ class MicroBenchmarkControllerTest : public testing::Test {
     layer_tree_host_impl_ = nullptr;
     layer_tree_host_ = nullptr;
     impl_task_runner_provider_ = nullptr;
+    animation_host_ = nullptr;
   }
 
   FakeLayerTreeHostClient layer_tree_host_client_;
   TestTaskGraphRunner task_graph_runner_;
+  std::unique_ptr<AnimationHost> animation_host_;
   std::unique_ptr<FakeLayerTreeHost> layer_tree_host_;
   std::unique_ptr<FakeLayerTreeHostImpl> layer_tree_host_impl_;
   std::unique_ptr<FakeImplTaskRunnerProvider> impl_task_runner_provider_;