Revert of mus: Enable system modal windows

components/mus/ws/modal_window_controller.cc

Index: components/mus/ws/modal_window_controller.cc
diff --git a/components/mus/ws/modal_window_controller.cc b/components/mus/ws/modal_window_controller.cc
deleted file mode 100644
index 89ec02e37207a52ab8aa194bfd78a035cb4fd6d1..0000000000000000000000000000000000000000
--- a/components/mus/ws/modal_window_controller.cc
+++ /dev/null
@@ -1,121 +0,0 @@
-// 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 "components/mus/ws/modal_window_controller.h"
-
-#include "base/stl_util.h"
-#include "components/mus/ws/event_dispatcher.h"
-#include "components/mus/ws/server_window.h"
-#include "components/mus/ws/server_window_drawn_tracker.h"
-
-namespace mus {
-namespace ws {
-namespace {
-
-const ServerWindow* GetModalChildForWindowAncestor(const ServerWindow* window) {
-  for (const ServerWindow* ancestor = window; ancestor;
-       ancestor = ancestor->parent()) {
-    for (const auto& transient_child : ancestor->transient_children()) {
-      if (transient_child->is_modal() && transient_child->IsDrawn())
-        return transient_child;
-    }
-  }
-  return nullptr;
-}
-
-const ServerWindow* GetWindowModalTargetForWindow(const ServerWindow* window) {
-  const ServerWindow* modal_window = GetModalChildForWindowAncestor(window);
-  if (!modal_window)
-    return window;
-  return GetWindowModalTargetForWindow(modal_window);
-}
-
-}  // namespace
-
-ModalWindowController::ModalWindowController(EventDispatcher* event_dispatcher)
-    : event_dispatcher_(event_dispatcher) {}
-
-ModalWindowController::~ModalWindowController() {
-  for (auto it = system_modal_windows_.begin();
-       it != system_modal_windows_.end(); it++) {
-    (*it)->RemoveObserver(this);
-  }
-}
-
-void ModalWindowController::AddSystemModalWindow(ServerWindow* window) {
-  DCHECK(window);
-  DCHECK(!ContainsValue(system_modal_windows_, window));
-
-  window->SetModal();
-  system_modal_windows_.push_back(window);
-  window_drawn_trackers_.insert(make_pair(
-      window, base::WrapUnique(new ServerWindowDrawnTracker(window, this))));
-  window->AddObserver(this);
-
-  event_dispatcher_->ReleaseCaptureBlockedByModalWindow(window);
-}
-
-bool ModalWindowController::IsWindowBlockedBy(
-    const ServerWindow* window,
-    const ServerWindow* modal_window) const {
-  DCHECK(window);
-  DCHECK(modal_window);
-  if (!modal_window->is_modal() || !modal_window->IsDrawn())
-    return false;
-
-  if (modal_window->transient_parent() &&
-      !modal_window->transient_parent()->Contains(window)) {
-    return false;
-  }
-
-  return true;
-}
-
-bool ModalWindowController::IsWindowBlocked(const ServerWindow* window) const {
-  DCHECK(window);
-  return GetActiveSystemModalWindow() || GetModalChildForWindowAncestor(window);
-}
-
-const ServerWindow* ModalWindowController::GetTargetForWindow(
-    const ServerWindow* window) const {
-  ServerWindow* system_modal_window = GetActiveSystemModalWindow();
-  return system_modal_window ? system_modal_window
-                             : GetWindowModalTargetForWindow(window);
-}
-
-ServerWindow* ModalWindowController::GetActiveSystemModalWindow() const {
-  for (auto it = system_modal_windows_.rbegin();
-       it != system_modal_windows_.rend(); it++) {
-    ServerWindow* modal = *it;
-    if (modal->IsDrawn())
-      return modal;
-  }
-  return nullptr;
-}
-
-void ModalWindowController::OnWindowDestroyed(ServerWindow* window) {
-  window->RemoveObserver(this);
-  auto it = std::find(system_modal_windows_.begin(),
-                      system_modal_windows_.end(), window);
-  DCHECK(it != system_modal_windows_.end());
-  system_modal_windows_.erase(it);
-  window_drawn_trackers_.erase(window);
-}
-
-void ModalWindowController::OnDrawnStateChanged(ServerWindow* ancestor,
-                                                ServerWindow* window,
-                                                bool is_drawn) {
-  if (!is_drawn)
-    return;
-
-  // Move the most recently shown window to the end of the list.
-  auto it = std::find(system_modal_windows_.begin(),
-                      system_modal_windows_.end(), window);
-  DCHECK(it != system_modal_windows_.end());
-  system_modal_windows_.splice(system_modal_windows_.end(),
-                               system_modal_windows_, it);
-}
-
-}  // namespace ws
-}  // namespace mus