[WIN] Remove "Pin this program to taskbar" of panel window.

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 273 matching lines @@
        iter != accelerator_table.end(); ++iter) {
     focus_manager->RegisterAccelerator(
         iter->first, ui::AcceleratorManager::kNormalPriority, this);
   }
 
 #if defined(OS_WIN)
   ui::win::SetAppIdForWindow(
       ShellIntegration::GetAppModelIdForProfile(UTF8ToWide(panel->app_name()),
                                                 panel->profile()->GetPath()),
       views::HWNDForWidget(window_));
+  ui::win::PreventWindowFromPinning(views::HWNDForWidget(window_));
 #endif
 }
 
 PanelView::~PanelView() {
 }
 
 void PanelView::ShowPanel() {
   ShowPanelInactive();
   ActivatePanel();
 }
@@ skipping 834 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
 }