Remove all blimp engine code

blimp/engine/app/ui/blimp_screen.cc

-// 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 "blimp/engine/app/ui/blimp_screen.h"
-
-#include "ui/aura/window.h"
-#include "ui/aura/window_tree_host.h"
-#include "ui/display/display_observer.h"
-#include "ui/gfx/geometry/size.h"
-
-namespace blimp {
-namespace engine {
-
-namespace {
-
-const int64_t kDisplayId = 1;
-
-}  // namespace
-
-BlimpScreen::BlimpScreen() {
-  display::Display display(kDisplayId);
-  ProcessDisplayChanged(display, true /* is_primary */);
-}
-
-BlimpScreen::~BlimpScreen() {}
-
-void BlimpScreen::UpdateDisplayScaleAndSize(float scale,
-                                            const gfx::Size& size) {
-  display::Display display(GetPrimaryDisplay());
-  if (scale == display.device_scale_factor() &&
-      size == display.GetSizeInPixel()) {
-    return;
-  }
-
-  display.SetScaleAndBounds(scale, gfx::Rect(size));
-  display_list().UpdateDisplay(display);
-}
-
-gfx::Point BlimpScreen::GetCursorScreenPoint() {
-  return gfx::Point();
-}
-
-bool BlimpScreen::IsWindowUnderCursor(gfx::NativeWindow window) {
-  NOTIMPLEMENTED();
-  return false;
-}
-
-gfx::NativeWindow BlimpScreen::GetWindowAtScreenPoint(const gfx::Point& point) {
-  return window_tree_host_
-             ? window_tree_host_->window()->GetTopWindowContainingPoint(point)
-             : gfx::NativeWindow(nullptr);
-}
-
-display::Display BlimpScreen::GetDisplayNearestWindow(
-    gfx::NativeWindow window) const {
-  return GetPrimaryDisplay();
-}
-
-}  // namespace engine
-}  // namespace blimp