Revert EnableClose() removal and related crash fixes. I don't understand the crashes here, and th...

chrome/browser/ui/panels/panel_browser_frame_view.cc

 // Copyright (c) 2011 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/panel_browser_frame_view.h"
 
 #include <algorithm>
 
 #include "base/utf_string_conversions.h"
 #include "chrome/browser/themes/theme_service.h"
@@ skipping 417 matching lines @@
   window_mask->lineTo(SkIntToScalar(size.width() - 2), 1);
   window_mask->lineTo(SkIntToScalar(size.width() - 1), 1);
   window_mask->lineTo(SkIntToScalar(size.width() - 1), 2);
   window_mask->lineTo(SkIntToScalar(size.width() - 1), 3);
   window_mask->lineTo(SkIntToScalar(size.width()),
                       SkIntToScalar(size.height()));
   window_mask->lineTo(0, SkIntToScalar(size.height()));
   window_mask->close();
 }
 
+void PanelBrowserFrameView::EnableClose(bool enable) {
+  close_button_->SetEnabled(enable);
+}
+
 void PanelBrowserFrameView::ResetWindowControls() {
   // The close button isn't affected by this constraint.
 }
 
 void PanelBrowserFrameView::UpdateWindowIcon() {
   title_icon_->SchedulePaint();
 }
 
 void PanelBrowserFrameView::OnPaint(gfx::Canvas* canvas) {
   // The font and color need to be updated depending on the panel's state.
@@ skipping 415 matching lines @@
 
   settings_menu_model_.reset(
       new PanelSettingsMenuModel(panel_browser_view_->panel()));
   settings_menu_adapter_.reset(
       new views::MenuModelAdapter(settings_menu_model_.get()));
   settings_menu_ = new views::MenuItemView(settings_menu_adapter_.get());
   settings_menu_adapter_->BuildMenu(settings_menu_);
   settings_menu_runner_.reset(new views::MenuRunner(settings_menu_));
   return true;
 }