Print preview: Disable the right context menu items in print preview.

chrome/chrome_browser.gypi

 # 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.
 
 {
   'targets': [
     {
       'target_name': 'browser',
       'type': 'static_library',
       'variables': { 'enable_wexit_time_destructors': 1, },
@@ skipping 1927 matching lines @@
         'browser/printing/print_dialog_cloud.h',
         'browser/printing/print_dialog_gtk.cc',
         'browser/printing/print_dialog_gtk.h',
         'browser/printing/print_job.cc',
         'browser/printing/print_job.h',
         'browser/printing/print_job_manager.cc',
         'browser/printing/print_job_manager.h',
         'browser/printing/print_job_worker.cc',
         'browser/printing/print_job_worker.h',
         'browser/printing/print_job_worker_owner.h',
+        'browser/printing/print_preview_context_menu_observer.cc',
+        'browser/printing/print_preview_context_menu_observer.h',
         'browser/printing/print_preview_data_service.cc',
         'browser/printing/print_preview_data_service.h',
         'browser/printing/print_preview_message_handler.cc',
         'browser/printing/print_preview_message_handler.h',
         'browser/printing/print_preview_tab_controller.cc',
         'browser/printing/print_preview_tab_controller.h',
         'browser/printing/print_system_task_proxy.cc',
         'browser/printing/print_system_task_proxy.h',
         'browser/printing/print_view_manager.cc',
         'browser/printing/print_view_manager.h',
@@ skipping 3292 matching lines @@
       'type': 'static_library',
       'sources': [ 'browser/history/in_memory_url_index_cache.proto' ],
       'variables': {
         'proto_in_dir': 'browser/history',
         'proto_out_dir': 'chrome/browser/history',
       },
       'includes': [ '../build/protoc.gypi' ]
     },
   ],
 }