mus: Rename GpuService to Gpu.

services/ui/demo/mus_demo.h

Index: services/ui/demo/mus_demo.h
diff --git a/services/ui/demo/mus_demo.h b/services/ui/demo/mus_demo.h
index 539dcb7f987531217ea785276c517da834f61b49..4cc334272a1242fc5b011448c6f44a3554526dc1 100644
--- a/services/ui/demo/mus_demo.h
+++ b/services/ui/demo/mus_demo.h
@@ -39,7 +39,7 @@ class WMState;
 
 namespace ui {
 class ContextFactory;
-class GpuService;
+class Gpu;
 
 namespace demo {
 
@@ -106,7 +106,7 @@ class MusDemo : public service_manager::Service,
   aura::Window* root_window_ = nullptr;
   std::unique_ptr<aura::WindowTreeClient> window_tree_client_;
   std::unique_ptr<aura::WindowTreeHostMus> window_tree_host_;
-  std::unique_ptr<ui::GpuService> gpu_service_;
+  std::unique_ptr<ui::Gpu> gpu_;
   std::unique_ptr<ui::ContextFactory> context_factory_;
   std::unique_ptr<aura::Env> env_;
   std::unique_ptr<display::ScreenBase> screen_;