Remove a bunch of TOOLKIT_GTK in content/ and gpu/, as well as NPAPI plugins on linux

content/content_plugin.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.
 
 {
   'conditions': [
-    ['enable_plugins==1', {
+    ['enable_plugins==1 and OS!="linux"', {
       'dependencies': [
         '../skia/skia.gyp:skia',
         '../third_party/WebKit/public/blink.gyp:blink',
         '../third_party/npapi/npapi.gyp:npapi',
       ],
       'include_dirs': [
         '<(INTERMEDIATE_DIR)',
       ],
       'sources': [
         # All .cc, .h, .m, and .mm files under plugins except for tests and
         # mocks.
         'plugin/plugin_channel.cc',
         'plugin/plugin_channel.h',
         'plugin/plugin_interpose_util_mac.mm',
         'plugin/plugin_interpose_util_mac.h',
         'plugin/plugin_main.cc',
-        'plugin/plugin_main_linux.cc',
         'plugin/plugin_main_mac.mm',
         'plugin/plugin_thread.cc',
         'plugin/plugin_thread.h',
         'plugin/webplugin_accelerated_surface_proxy_mac.cc',
         'plugin/webplugin_accelerated_surface_proxy_mac.h',
         'plugin/webplugin_delegate_stub.cc',
         'plugin/webplugin_delegate_stub.h',
         'plugin/webplugin_proxy.cc',
         'plugin/webplugin_proxy.h',
         'public/plugin/content_plugin_client.h',
       ],
       # These are layered in conditionals in the event other platforms
       # end up using this module as well.
       'conditions': [
-        ['os_bsd==1', {
-          'sources/': [
-            ['exclude', '^plugin/plugin_main_linux\\.cc$'],
-          ],
-        }],
         ['OS=="win"', {
           'include_dirs': [
             '<(DEPTH)/third_party/wtl/include',
           ],
         }],
-        ['use_x11 == 1', {
-          'dependencies': [
-            '../build/linux/system.gyp:xext',
-          ],
-        }],
       ],
     }],
   ],
 }