Revert of Android: support multiple displays on C++ side

ui/android/dummy_screen_android.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/android/dummy_screen_android.h"
-#include "ui/display/display.h"
-#include "ui/display/screen.h"
-
-namespace ui {
-
-using display::Display;
-using display::DisplayObserver;
-
-// A Screen for Android unit tests that do not talk to Java. The class contains
-// one primary display with default Display configuration and 256x512 dip size.
-class DummyScreenAndroid : public display::Screen {
- public:
-  DummyScreenAndroid() {}
-  ~DummyScreenAndroid() override {}
-
-  // Screen interface.
-
-  gfx::Point GetCursorScreenPoint() override { return gfx::Point(); }
-
-  bool IsWindowUnderCursor(gfx::NativeWindow window) override { return false; }
-
-  gfx::NativeWindow GetWindowAtScreenPoint(const gfx::Point& point) override {
-    return NULL;
-  }
-
-  int GetNumDisplays() const override { return 1; }
-
-  std::vector<Display> GetAllDisplays() const override {
-    return std::vector<Display>(1, GetPrimaryDisplay());
-  }
-
-  Display GetDisplayNearestWindow(gfx::NativeView view) const override {
-    return GetPrimaryDisplay();
-  }
-
-  Display GetDisplayNearestPoint(const gfx::Point& point) const override {
-    return GetPrimaryDisplay();
-  }
-
-  Display GetDisplayMatching(const gfx::Rect& match_rect) const override {
-    return GetPrimaryDisplay();
-  }
-
-  Display GetPrimaryDisplay() const override {
-    const int display_id = 0;
-    const gfx::Rect bounds_in_dip(256, 512);
-    return display::Display(display_id, bounds_in_dip);
-  }
-
-  void AddObserver(DisplayObserver* observer) override {}
-  void RemoveObserver(DisplayObserver* observer) override {}
-};
-
-display::Screen* CreateDummyScreenAndroid() {
-  return new DummyScreenAndroid;
-}
-
-}  // namespace ui