Refactor: remove SetDisplayWorkAreaInsets calls.

ash/display/display_manager.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 "ash/display/display_manager.h"
 
 #include <algorithm>
 #include <cmath>
 #include <limits>
 #include <map>
@@ skipping 271 matching lines @@
       FindDisplayIndexContainingPoint(active_display_list_, point_in_screen);
   return index < 0 ? GetInvalidDisplay() : active_display_list_[index];
 }
 
 bool DisplayManager::UpdateWorkAreaOfDisplay(int64_t display_id,
                                              const gfx::Insets& insets) {
   display::Display* display = FindDisplayForId(display_id);
   DCHECK(display);
   gfx::Rect old_work_area = display->work_area();
   display->UpdateWorkAreaFromInsets(insets);
-  return old_work_area != display->work_area();
+  bool workarea_changed = old_work_area != display->work_area();
+  if (workarea_changed) {
+    screen_->NotifyMetricsChanged(
+        *display, display::DisplayObserver::DISPLAY_METRIC_WORK_AREA);
+  }
+  return workarea_changed;
 }
 
 void DisplayManager::SetOverscanInsets(int64_t display_id,
                                        const gfx::Insets& insets_in_dip) {
   bool update = false;
   DisplayInfoList display_info_list;
   for (const auto& display : active_display_list_) {
     DisplayInfo info = GetDisplayInfo(display.id());
     if (info.id() == display_id) {
       if (insets_in_dip.IsEmpty()) {
@@ skipping 1031 matching lines @@
   layout.ApplyToDisplayList(display_list, updated_ids,
                             kMinimumOverlapForInvalidOffset);
 }
 
 void DisplayManager::RunPendingTasksForTest() {
   if (!software_mirroring_display_list_.empty())
     base::RunLoop().RunUntilIdle();
 }
 
 }  // namespace ash