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

chrome/browser/ui/panels/docked_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/docked_panel_collection.h"
 
 #include <math.h>
 
 #include <algorithm>
 #include <vector>
@@ skipping 747 matching lines @@
 
   // Start from the bottom to avoid reshuffling.
   for (Panels::reverse_iterator iter = panels_copy.rbegin();
        iter != panels_copy.rend(); ++iter)
     (*iter)->Close();
 }
 
 void DockedPanelCollection::UpdatePanelOnCollectionChange(Panel* panel) {
   panel->set_attention_mode(Panel::USE_PANEL_ATTENTION);
   panel->ShowShadow(true);
-  panel->EnableResizeByMouse(true);
   panel->UpdateMinimizeRestoreButtonVisibility();
   panel->SetWindowCornerStyle(panel::TOP_ROUNDED);
 }
 
 void DockedPanelCollection::ScheduleLayoutRefresh() {
   refresh_action_factory_.InvalidateWeakPtrs();
   base::MessageLoop::current()->PostDelayedTask(
       FROM_HERE,
       base::Bind(&DockedPanelCollection::RefreshLayout,
                  refresh_action_factory_.GetWeakPtr()),
@@ skipping 12 matching lines @@
       const gfx::Rect& requested_bounds) const {
   gfx::Rect initial_bounds = requested_bounds;
   initial_bounds.set_origin(
       GetDefaultPositionForPanel(requested_bounds.size()));
   return initial_bounds;
 }
 
 bool DockedPanelCollection::HasPanel(Panel* panel) const {
   return find(panels_.begin(), panels_.end(), panel) != panels_.end();
 }