Refators display related functionality into own class

components/mus/ws/test_utils.h

 // Copyright 2016 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.
 
 #ifndef COMPONENTS_MUS_WS_TEST_UTILS_H_
 #define COMPONENTS_MUS_WS_TEST_UTILS_H_
 
 #include <stdint.h>
 
 #include "components/mus/public/interfaces/window_tree.mojom.h"
@@ skipping 193 matching lines @@
 
   void set_num_displays_to_create(int count) {
     num_displays_to_create_ = count;
   }
 
   TestWindowTreeClient* last_client() {
     return last_binding_ ? last_binding_->client() : nullptr;
   }
   TestWindowTreeBinding* last_binding() { return last_binding_; }
 
-  bool got_on_no_more_connections() const {
-    return got_on_no_more_connections_;
-  }
+  bool got_on_no_more_displays() const { return got_on_no_more_displays_; }
 
   // ConnectionManagerDelegate:
-  void OnNoMoreRootConnections() override;
+  void OnNoMoreDisplays() override;
   scoped_ptr<WindowTreeBinding> CreateWindowTreeBindingForEmbedAtWindow(
       ws::ConnectionManager* connection_manager,
       ws::WindowTree* tree,
       mojom::WindowTreeRequest tree_request,
       mojom::WindowTreeClientPtr client) override;
   void CreateDefaultDisplays() override;
 
  private:
   // If CreateDefaultDisplays() this is the number of Displays that are
   // created. The default is 0, which results in a DCHECK.
   int num_displays_to_create_ = 0;
   TestWindowTreeBinding* last_binding_ = nullptr;
   Display* display_ = nullptr;
   ConnectionManager* connection_manager_ = nullptr;
-  bool got_on_no_more_connections_ = false;
+  bool got_on_no_more_displays_ = false;
 
   DISALLOW_COPY_AND_ASSIGN(TestConnectionManagerDelegate);
 };
 
 }  // namespace test
 }  // namespace ws
 }  // namespace mus
 
 #endif  // COMPONENTS_MUS_WS_TEST_UTILS_H_