Refactor screen/monitor so that gfx::Screen returns monitor object.

ui/gfx/screen.cc

+// Copyright (c) 2012 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/gfx/screen.h"
+
+#include "ui/gfx/monitor.h"
+
+namespace gfx {
+
+// Utility functions to get Monitor bounds/WorkArea bounds.
+// static
+gfx::Rect Screen::GetMonitorAreaNearestWindow(gfx::NativeView view) {
+  return GetMonitorNearestWindow(view)->GetBounds();
+}
+
+gfx::Rect Screen::GetMonitorWorkAreaNearestWindow(gfx::NativeView view) {
+  return GetMonitorNearestWindow(view)->GetWorkArea();
+}
+
+gfx::Rect Screen::GetMonitorAreaNearestPoint(const gfx::Point& point) {
+  return GetMonitorNearestPoint(point)->GetBounds();
+}
+
+gfx::Rect Screen::GetMonitorWorkAreaNearestPoint(const gfx::Point& point) {
+  return GetMonitorNearestPoint(point)->GetWorkArea();
+}
+
+#if defined(USE_AURA)
+ScreenImpl::~ScreenImpl() {}
+#endif
+
+}  // namespace gfx