Remove deprecated Ozone initialization functions.

ui/ozone/platform/x11/ozone_platform_x11.cc

 // 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.
 
 #include "ui/ozone/platform/x11/ozone_platform_x11.h"
 
 #include <X11/Xlib.h>
 
 #include <memory>
 #include <utility>
@@ skipping 76 matching lines @@
   void InitializeUI(const InitParams& params) override {
     InitializeCommon(params);
     CreatePlatformEventSource();
     window_manager_ = base::MakeUnique<X11WindowManagerOzone>();
     overlay_manager_ = base::MakeUnique<StubOverlayManager>();
     input_controller_ = CreateStubInputController();
     cursor_factory_ozone_ = base::MakeUnique<X11CursorFactoryOzone>();
     gpu_platform_support_host_.reset(CreateStubGpuPlatformSupportHost());
   }
 
-  void InitializeUI() override { NOTREACHED(); }
-
   void InitializeGPU(const InitParams& params) override {
     InitializeCommon(params);
 
     // In single process mode either the UI thread will create an event source
     // or it's a test and an event source isn't desired.
     if (!params.single_process && !RunningInsideMus())
       CreatePlatformEventSource();
 
     surface_factory_ozone_ = base::MakeUnique<X11SurfaceFactory>();
   }
 
-  void InitializeGPU() override { NOTREACHED(); }
-
   base::MessageLoop::Type GetMessageLoopTypeForGpu() override {
     // When Ozone X11 backend is running use an UI loop to grab Expose events.
     // See GLSurfaceGLX and https://crbug.com/326995.
     return base::MessageLoop::TYPE_UI;
   }
 
  private:
   // Performs initialization steps need by both UI and GPU.
   void InitializeCommon(const InitParams& params) {
     // TODO(kylechar): Add DCHECK we only enter InitializeCommon() twice for
@@ skipping 37 matching lines @@
   DISALLOW_COPY_AND_ASSIGN(OzonePlatformX11);
 };
 
 }  // namespace
 
 OzonePlatform* CreateOzonePlatformX11() {
   return new OzonePlatformX11;
 }
 
 }  // namespace ui