Switch to doing user-resizing via system for panels on Mac

chrome/browser/ui/panels/detached_panel_collection.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 "chrome/browser/ui/panels/detached_panel_collection.h"
 
 #include <algorithm>
 #include "base/logging.h"
 #include "chrome/browser/ui/panels/display_settings_provider.h"
 #include "chrome/browser/ui/panels/panel_drag_controller.h"
@@ skipping 221 matching lines @@
 
 void DetachedPanelCollection::SortPanels(PanelsComparer comparer) {
   panels_.sort(comparer);
 }
 
 void DetachedPanelCollection::UpdatePanelOnCollectionChange(Panel* panel) {
   panel->set_attention_mode(
       static_cast<Panel::AttentionMode>(Panel::USE_PANEL_ATTENTION |
                                         Panel::USE_SYSTEM_ATTENTION));
   panel->ShowShadow(true);
-  panel->EnableResizeByMouse(true);
   panel->UpdateMinimizeRestoreButtonVisibility();
   panel->SetWindowCornerStyle(panel::ALL_ROUNDED);
 }
 
 void DetachedPanelCollection::OnPanelExpansionStateChanged(Panel* panel) {
   // This should only be reached when a minimized stacked panel is dragged out
   // of the stack to become detached. For this case, the panel needs to be
   // restored.
   DCHECK_EQ(Panel::EXPANDED, panel->expansion_state());
 
@@ skipping 30 matching lines @@
 
 void DetachedPanelCollection::ComputeNextDefaultPanelOrigin() {
   default_panel_origin_.Offset(kPanelTilePixels, kPanelTilePixels);
   gfx::Rect work_area =
       panel_manager_->display_settings_provider()->GetPrimaryWorkArea();
   if (!work_area.Contains(default_panel_origin_)) {
     default_panel_origin_.SetPoint(kPanelTilePixels + work_area.x(),
                                    kPanelTilePixels + work_area.y());
   }
 }