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

ui/base/win/shell.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 "ui/base/win/shell.h"
 
 #include <dwmapi.h>
 #include <shlobj.h>  // Must be before propkey.
 #include <propkey.h>
 #include <shellapi.h>
@@ skipping 80 matching lines @@
 bool OpenItemViaShell(const base::FilePath& full_path) {
   return OpenAnyViaShell(full_path.value(), full_path.DirName().value(),
                          string16(), 0);
 }
 
 bool OpenItemViaShellNoZoneCheck(const base::FilePath& full_path) {
   return OpenAnyViaShell(full_path.value(), string16(), string16(),
                          SEE_MASK_NOZONECHECKS | SEE_MASK_FLAG_DDEWAIT);
 }
 
+bool PreventWindowFromPinning(HWND hwnd) {
+  // This functionality is only available on Win7+. It also doesn't make sense
+  // to do this for Chrome Metro.
+  if (base::win::GetVersion() < base::win::VERSION_WIN7 ||
+      base::win::IsMetroProcess())
+    return false;
+  base::win::ScopedComPtr<IPropertyStore> pps;
+  HRESULT result = SHGetPropertyStoreForWindow(
+      hwnd, __uuidof(*pps), reinterpret_cast<void**>(pps.Receive()));
+  if (FAILED(result))
+    return false;
+
+  return base::win::SetBooleanValueForPropertyStore(
+             pps, PKEY_AppUserModel_PreventPinning, true);
+}
+
 void SetAppIdForWindow(const string16& app_id, HWND hwnd) {
   SetAppDetailsForWindow(app_id, string16(), string16(), string16(), hwnd);
 }
 
 void SetAppIconForWindow(const string16& app_icon, HWND hwnd) {
   SetAppDetailsForWindow(string16(), app_icon, string16(), string16(), hwnd);
 }
 
 void SetRelaunchDetailsForWindow(const string16& relaunch_command,
                                  const string16& display_name,
@@ skipping 16 matching lines @@
 
   if (base::win::GetVersion() < base::win::VERSION_VISTA)
     return false;
   // If composition is not enabled, we behave like on XP.
   BOOL enabled = FALSE;
   return SUCCEEDED(DwmIsCompositionEnabled(&enabled)) && enabled;
 }
 
 }  // namespace win
 }  // namespace ui