Only build various flash/pnacl/ppapi code when they are enabled.

chrome/chrome_browser_ui.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': {
     'chrome_browser_ui_non_ios_sources': [
       'browser/ui/accelerator_utils.h',
       'browser/ui/android/android_about_app_info.cc',
       'browser/ui/android/android_about_app_info.h',
@@ skipping 1035 matching lines @@
       'browser/ui/webui/devtools_ui.cc',
       'browser/ui/webui/devtools_ui.h',
       'browser/ui/webui/domain_reliability_internals_ui.cc',
       'browser/ui/webui/domain_reliability_internals_ui.h',
       'browser/ui/webui/favicon_source.cc',
       'browser/ui/webui/favicon_source.h',
       'browser/ui/webui/fileicon_source.cc',
       'browser/ui/webui/fileicon_source.h',
       'browser/ui/webui/flags_ui.cc',
       'browser/ui/webui/flags_ui.h',
-      'browser/ui/webui/flash_ui.cc',
-      'browser/ui/webui/flash_ui.h',
       'browser/ui/webui/gcm_internals_ui.cc',
       'browser/ui/webui/gcm_internals_ui.h',
       'browser/ui/webui/history_ui.cc',
       'browser/ui/webui/history_ui.h',
       'browser/ui/webui/instant_ui.cc',
       'browser/ui/webui/instant_ui.h',
       'browser/ui/webui/interstitials/interstitial_ui.cc',
       'browser/ui/webui/interstitials/interstitial_ui.h',
       'browser/ui/webui/invalidations_message_handler.cc',
       'browser/ui/webui/invalidations_message_handler.h',
@@ skipping 773 matching lines @@
       'browser/ui/cocoa/task_manager_mac.mm',
       'browser/ui/views/task_manager_view.cc',
     ],
     'chrome_browser_ui_nacl_sources': [
       'browser/ui/webui/nacl_ui.cc',
       'browser/ui/webui/nacl_ui.h',
     ],
     'chrome_browser_ui_plugin_sources': [
       'browser/ui/hung_plugin_tab_helper.cc',
       'browser/ui/hung_plugin_tab_helper.h',
+      'browser/ui/webui/flash_ui.cc',
+      'browser/ui/webui/flash_ui.h',
     ],
     'chrome_browser_ui_policy_sources': [
       'browser/ui/webui/policy_ui.cc',
       'browser/ui/webui/policy_ui.h',
     ],
     # Cross-platform (except Mac) views sources. We assume app list is enabled.
     'chrome_browser_ui_views_non_mac_sources': [
       'browser/ui/views/accelerator_utils_aura.cc',
       'browser/ui/views/accessibility/invert_bubble_view.cc',
       'browser/ui/views/accessibility/invert_bubble_view.h',
@@ skipping 746 matching lines @@
             'browser/performance_monitor/performance_monitor.gyp:performance_monitor',
             'chrome_web_ui_mojo_bindings.gyp:web_ui_mojo_bindings',
             'common/extensions/api/api.gyp:chrome_api',
             'debugger',
             'installer_util',
             '../components/components.gyp:autofill_content_risk_proto',
             '../components/components.gyp:translate_content_common',
             '../media/media.gyp:media',
             '../mojo/mojo_base.gyp:mojo_system_impl',
             '../net/net.gyp:net_with_v8',
-            '../third_party/adobe/flash/flash_player.gyp:flapper_version_h',
             '../third_party/expat/expat.gyp:expat',
             '../third_party/leveldatabase/leveldatabase.gyp:leveldatabase',
             '../third_party/libjingle/libjingle.gyp:libjingle',
             '../third_party/npapi/npapi.gyp:npapi',
             '../third_party/re2/re2.gyp:re2',
             '../ui/compositor/compositor.gyp:compositor',
             '../ui/surface/surface.gyp:surface',
             '../ui/web_dialogs/web_dialogs.gyp:web_dialogs',
             '../v8/tools/gyp/v8.gyp:v8',
             '../webkit/storage_browser.gyp:webkit_storage_browser',
@@ skipping 39 matching lines @@
         ['configuration_policy==1', {
           'sources': [ '<@(chrome_browser_ui_policy_sources)' ],
           'dependencies': [
             '../components/components.gyp:policy',
           ],
         }],
         ['enable_plugins==1', {
           'sources': [ '<@(chrome_browser_ui_plugin_sources)' ],
           'dependencies': [
             '../ppapi/ppapi_internal.gyp:ppapi_ipc',
+            '../third_party/adobe/flash/flash_player.gyp:flapper_version_h',
           ],
         }],
         ['safe_browsing==1', {
           'defines': [
             'FULL_SAFE_BROWSING',
           ],
           'dependencies': [
             'safe_browsing_chunk_proto',
             'safe_browsing_proto',
             'safe_browsing_report_proto',
@@ skipping 281 matching lines @@
         }],
         ['OS!="android" and OS!="ios"', {
           'dependencies': [
             '../device/bluetooth/bluetooth.gyp:device_bluetooth',
           ],
         }],
       ],
     },
   ],
 }