Restored disable print preview policy.

chrome/browser/ui/webui/chrome_web_ui_controller_factory.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/webui/chrome_web_ui_controller_factory.h"
 
 #include <vector>
 
 #include "base/bind.h"
 #include "base/command_line.h"
@@ skipping 510 matching lines @@
 #endif
       ) {
     return &NewWebUI<AboutUI>;
   }
 
 #if defined(ENABLE_EXTENSIONS)
   if (url.host() == chrome::kChromeUIExtensionsFrameHost)
     return &NewWebUI<extensions::ExtensionsUI>;
 #endif
 #if defined(ENABLE_FULL_PRINTING)
-  if (url.host() == chrome::kChromeUIPrintHost)
+  if (url.host() == chrome::kChromeUIPrintHost &&
+      !profile->GetPrefs()->GetBoolean(prefs::kPrintPreviewDisabled)) {
     return &NewWebUI<PrintPreviewUI>;
+  }
 #endif
 
   if (IsEnableDomDistillerSet() &&
       url.host() == dom_distiller::kChromeUIDomDistillerHost) {
     return &NewWebUI<dom_distiller::DomDistillerUi>;
   }
 
   return NULL;
 }
 
@@ skipping 178 matching lines @@
 #endif
 
   // Android doesn't use the plugins pages.
   if (page_url.host() == chrome::kChromeUIPluginsHost)
     return PluginsUI::GetFaviconResourceBytes(scale_factor);
 
 #endif
 
   return NULL;
 }