chromeos: removes mash shadows

ash/mus/shadow_controller.cc

Index: ash/mus/shadow_controller.cc
diff --git a/ash/mus/shadow_controller.cc b/ash/mus/shadow_controller.cc
deleted file mode 100644
index 605d0bb1a54b40bac21883775c87d40724ac0a3d..0000000000000000000000000000000000000000
--- a/ash/mus/shadow_controller.cc
+++ /dev/null
@@ -1,90 +0,0 @@
-// 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 "ash/mus/shadow_controller.h"
-
-#include "ash/mus/shadow.h"
-#include "ui/aura/client/focus_client.h"
-#include "ui/aura/env.h"
-#include "ui/aura/window.h"
-
-namespace ash {
-namespace mus {
-namespace {
-
-// Returns the first ancestor of |from| (including |from|) that has a shadow.
-aura::Window* FindAncestorWithShadow(aura::Window* from) {
-  aura::Window* result = from;
-  while (result && !Shadow::Get(result))
-    result = result->parent();
-  // Small shadows never change.
-  return result && Shadow::Get(result)->style() != Shadow::STYLE_SMALL
-             ? result
-             : nullptr;
-}
-
-}  // namespace
-
-ShadowController::ShadowController() {
-  aura::Env::GetInstance()->AddObserver(this);
-  SetFocusClient(aura::Env::GetInstance()->active_focus_client());
-}
-
-ShadowController::~ShadowController() {
-  aura::Env::GetInstance()->RemoveObserver(this);
-  if (active_window_)
-    active_window_->RemoveObserver(this);
-  if (active_focus_client_)
-    active_focus_client_->RemoveObserver(this);
-}
-
-void ShadowController::SetActiveWindow(aura::Window* window) {
-  window = FindAncestorWithShadow(window);
-  if (window == active_window_)
-    return;
-
-  if (active_window_) {
-    if (Shadow::Get(active_window_))
-      Shadow::Get(active_window_)->SetStyle(Shadow::STYLE_INACTIVE);
-    active_window_->RemoveObserver(this);
-  }
-  active_window_ = window;
-  if (active_window_) {
-    Shadow::Get(active_window_)->SetStyle(Shadow::STYLE_ACTIVE);
-    active_window_->AddObserver(this);
-  }
-}
-
-void ShadowController::SetFocusClient(aura::client::FocusClient* focus_client) {
-  if (active_focus_client_)
-    active_focus_client_->RemoveObserver(this);
-  active_focus_client_ = focus_client;
-  if (active_focus_client_) {
-    active_focus_client_->AddObserver(this);
-    SetActiveWindow(active_focus_client_->GetFocusedWindow());
-  } else {
-    SetActiveWindow(nullptr);
-  }
-}
-
-void ShadowController::OnWindowInitialized(aura::Window* window) {}
-
-void ShadowController::OnActiveFocusClientChanged(
-    aura::client::FocusClient* focus_client,
-    aura::Window* window) {
-  SetFocusClient(focus_client);
-}
-
-void ShadowController::OnWindowFocused(aura::Window* gained_focus,
-                                       aura::Window* lost_focus) {
-  SetActiveWindow(gained_focus);
-}
-
-void ShadowController::OnWindowDestroying(aura::Window* window) {
-  DCHECK_EQ(window, active_window_);
-  SetActiveWindow(nullptr);
-}
-
-}  // namespace mus
-}  // namespace ash