cc: Clean up LayerTreeTest and TestHooks.

cc/trees/proxy_impl_unittest.cc

Index: cc/trees/proxy_impl_unittest.cc
diff --git a/cc/trees/proxy_impl_unittest.cc b/cc/trees/proxy_impl_unittest.cc
deleted file mode 100644
index 9ff15f13f5e3698dde73c5c05be40b4653bbe716..0000000000000000000000000000000000000000
--- a/cc/trees/proxy_impl_unittest.cc
+++ /dev/null
@@ -1,60 +0,0 @@
-// Copyright 2015 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#include "cc/test/fake_channel_impl.h"
-#include "cc/test/fake_layer_tree_host.h"
-#include "cc/test/fake_layer_tree_host_client.h"
-#include "cc/test/proxy_impl_for_test.h"
-#include "cc/test/test_hooks.h"
-#include "cc/test/test_task_graph_runner.h"
-#include "testing/gtest/include/gtest/gtest.h"
-
-namespace cc {
-
-class ProxyImplTest : public testing::Test, public TestHooks {
- public:
-  ~ProxyImplTest() override {
-    DebugScopedSetImplThreadAndMainThreadBlocked impl_and_main_blocked(
-        task_runner_provider_);
-    proxy_impl_.reset();
-  }
-
-  void RequestNewOutputSurface() override {}
-
- protected:
-  ProxyImplTest()
-      : host_client_(FakeLayerTreeHostClient::DIRECT_3D),
-        task_runner_provider_(nullptr) {}
-
-  void Initialize(CompositorMode mode) {
-    layer_tree_host_ = FakeLayerTreeHost::Create(
-        &host_client_, &task_graph_runner_, settings_, mode);
-    task_runner_provider_ = layer_tree_host_->task_runner_provider();
-    {
-      DebugScopedSetImplThreadAndMainThreadBlocked impl_and_main_blocked(
-          task_runner_provider_);
-      proxy_impl_ =
-          ProxyImplForTest::Create(this, &channel_impl_, layer_tree_host_.get(),
-                                   task_runner_provider_, nullptr);
-    }
-  }
-
-  TestTaskGraphRunner task_graph_runner_;
-  LayerTreeSettings settings_;
-  FakeLayerTreeHostClient host_client_;
-  FakeChannelImpl channel_impl_;
-  TaskRunnerProvider* task_runner_provider_;
-  std::unique_ptr<ProxyImplForTest> proxy_impl_;
-  std::unique_ptr<FakeLayerTreeHost> layer_tree_host_;
-};
-
-// This is a regression test. See crbug/568120.
-TEST_F(ProxyImplTest, NonZeroSmoothnessPriorityExpiration) {
-  Initialize(CompositorMode::THREADED);
-  DebugScopedSetImplThread impl_thread(task_runner_provider_);
-  EXPECT_FALSE(
-      proxy_impl_->smoothness_priority_expiration_notifier().delay().is_zero());
-}
-
-}  // namespace cc