Reland: Plugin Placeholders: Refactor for platforms that don't support plugins

components/plugins.gypi

 # Copyright 2013 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': [
     {
       # GN version: //components/plugins/common
       'target_name': 'plugins_common',
       'type': 'static_library',
@@ skipping 18 matching lines @@
             '../skia/skia.gyp:skia',
             '../third_party/WebKit/public/blink.gyp:blink',
             '../third_party/re2/re2.gyp:re2',
             '../v8/tools/gyp/v8.gyp:v8',
           ],
           'include_dirs': [
             '..',
           ],
           'sources': [
             # Note: sources list duplicated in GN build.
-            'plugins/renderer/loadable_plugin_placeholder.cc',
-            'plugins/renderer/loadable_plugin_placeholder.h',
             'plugins/renderer/plugin_placeholder.cc',
             'plugins/renderer/plugin_placeholder.h',
             'plugins/renderer/webview_plugin.cc',
             'plugins/renderer/webview_plugin.h',
           ],
           'conditions' : [
+            ['enable_plugins==1', {
+              'sources': [
+                # Note: sources list duplicated in GN build.
+                'plugins/renderer/loadable_plugin_placeholder.cc',
+                'plugins/renderer/loadable_plugin_placeholder.h',
+              ]
+            }],
             ['OS=="android"', {
               'sources': [
                 # Note: sources list duplicated in GN build.
                 'plugins/renderer/mobile_youtube_plugin.cc',
                 'plugins/renderer/mobile_youtube_plugin.h',
               ]
             }],
           ],
         },
       ],
     }],
   ],
 }