Removed redundant PrintingUIWebContentsObserver.

chrome/chrome_browser.gypi

 # Copyright 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.
 
 {
   'variables': {
     # All .cc, .h, .m, and .mm files under browser except for:
     # * tests and mocks.
     # * code below browser/chromeos
     # * code below browser/extensions
@@ skipping 1865 matching lines @@
       'browser/printing/print_job_worker.cc',
       'browser/printing/print_job_worker.h',
       'browser/printing/print_job_worker_owner.cc',
       'browser/printing/print_job_worker_owner.h',
       'browser/printing/print_view_manager_base.cc',
       'browser/printing/print_view_manager_base.h',
       'browser/printing/printer_query.cc',
       'browser/printing/printer_query.h',
       'browser/printing/printing_message_filter.cc',
       'browser/printing/printing_message_filter.h',
-      'browser/printing/printing_ui_web_contents_observer.cc',
-      'browser/printing/printing_ui_web_contents_observer.h',
     ],
     # Used on top of the "basic" sources when enable_printing == 1 (full).
     'chrome_browser_full_printing_sources': [
       'browser/local_discovery/privet_http_impl.cc',
       'browser/local_discovery/privet_http_impl.h',
       'browser/local_discovery/pwg_raster_converter.cc',
       'browser/local_discovery/pwg_raster_converter.h',
       'browser/printing/background_printing_manager.cc',
       'browser/printing/background_printing_manager.h',
       'browser/printing/cloud_print/cloud_print_proxy_service.cc',
@@ skipping 1688 matching lines @@
           'variables': {
             'proto_in_dir': 'browser/sync_file_system/drive_backend',
             'proto_out_dir': 'chrome/browser/sync_file_system/drive_backend',
           },
           'includes': [ '../build/protoc.gypi' ]
         },
       ],
     },],
   ],
 }