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

chrome/browser/ui/views/frame/app_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/views/frame/app_panel_browser_frame_view.h"
 
 #include "base/compiler_specific.h"
 #include "base/utf_string_conversions.h"
 #include "chrome/browser/ui/views/frame/browser_frame.h"
 #include "chrome/browser/ui/views/frame/browser_view.h"
@@ skipping 172 matching lines @@
   window_mask->lineTo(SkIntToScalar(size.width() - 1), 1);
   window_mask->lineTo(SkIntToScalar(size.width() - 1), 2);
   window_mask->lineTo(SkIntToScalar(size.width()), 3);
 
   window_mask->lineTo(SkIntToScalar(size.width()),
                       SkIntToScalar(size.height()));
   window_mask->lineTo(0, SkIntToScalar(size.height()));
   window_mask->close();
 }
 
+void AppPanelBrowserFrameView::EnableClose(bool enable) {
+  close_button_->SetEnabled(enable);
+}
+
 void AppPanelBrowserFrameView::ResetWindowControls() {
   // The close button isn't affected by this constraint.
 }
 
 void AppPanelBrowserFrameView::UpdateWindowIcon() {
   window_icon_->SchedulePaint();
 }
 
 
 ///////////////////////////////////////////////////////////////////////////////
@@ skipping 293 matching lines @@
 }
 
 gfx::Rect AppPanelBrowserFrameView::CalculateClientAreaBounds(int width,
     int height) const {
   int top_height = NonClientTopBorderHeight();
   int border_thickness = NonClientBorderThickness();
   return gfx::Rect(border_thickness, top_height,
                    std::max(0, width - (2 * border_thickness)),
                    std::max(0, height - top_height - border_thickness));
 }