Remove obsolete plugin state handling code.

chrome/browser/ui/BUILD.gn

 # Copyright 2014 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.
 
 import("//build/config/chromecast_build.gni")
 import("//build/config/crypto.gni")
 import("//build/config/features.gni")
 import("//build/config/ui.gni")
 import("//build/split_static_library.gni")
 import("//chrome/common/features.gni")
@@ skipping 756 matching lines @@
       "passwords/password_dialog_controller_impl.h",
       "passwords/password_dialog_prompts.h",
       "passwords/passwords_client_ui_delegate.cc",
       "passwords/passwords_client_ui_delegate.h",
       "passwords/passwords_model_delegate.cc",
       "passwords/passwords_model_delegate.h",
       "pdf/adobe_reader_info_win.cc",
       "pdf/adobe_reader_info_win.h",
       "pdf/chrome_pdf_web_contents_helper_client.cc",
       "pdf/chrome_pdf_web_contents_helper_client.h",
-      "pdf/pdf_unsupported_feature.cc",
-      "pdf/pdf_unsupported_feature.h",
       "sad_tab.cc",
       "sad_tab.h",
       "sad_tab_helper.cc",
       "sad_tab_helper.h",
       "sad_tab_types.h",
       "scoped_tabbed_browser_displayer.cc",
       "scoped_tabbed_browser_displayer.h",
       "search/instant_controller.cc",
       "search/instant_controller.h",
       "search/search_delegate.cc",
@@ skipping 2694 matching lines @@
       "test/test_confirm_bubble_model.cc",
       "test/test_confirm_bubble_model.h",
     ]
     deps += [ "//chrome/test:test_support_ui" ]
   }
 
   if (enable_extensions) {
     deps += [ "//extensions/browser" ]
   }
 }