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

chrome/browser/ui/views/panels/panel_view.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/views/panels/panel_view.h"
 
 #include <map>
 #include "base/logging.h"
 #include "base/message_loop/message_loop.h"
 #include "base/strings/utf_string_conversions.h"
@@ skipping 581 matching lines @@
 void PanelView::SetPanelAlwaysOnTop(bool on_top) {
   if (always_on_top_ == on_top)
     return;
   always_on_top_ = on_top;
 
   window_->SetAlwaysOnTop(on_top);
   window_->non_client_view()->Layout();
   window_->client_view()->Layout();
 }
 
-void PanelView::EnableResizeByMouse(bool enable) {
-  // Nothing to do since we use system resizing.
-}
-
 void PanelView::UpdatePanelMinimizeRestoreButtonVisibility() {
   GetFrameView()->UpdateTitlebarMinimizeRestoreButtonVisibility();
 }
 
 void PanelView::SetWindowCornerStyle(panel::CornerStyle corner_style) {
   GetFrameView()->SetWindowCornerStyle(corner_style);
 }
 
 void PanelView::PanelExpansionStateChanging(Panel::ExpansionState old_state,
                                             Panel::ExpansionState new_state) {
@@ skipping 523 matching lines @@
   DCHECK(thickness_for_mouse_resizing > 0);
   SkRegion* region = new SkRegion;
   region->op(0, 0, thickness_for_mouse_resizing, height, SkRegion::kUnion_Op);
   region->op(width - thickness_for_mouse_resizing, 0, width, height,
       SkRegion::kUnion_Op);
   region->op(0, height - thickness_for_mouse_resizing, width, height,
       SkRegion::kUnion_Op);
   web_contents->GetRenderViewHost()->GetView()->SetClickthroughRegion(region);
 #endif
 }