Remove GYP files from components.

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.
-
-{
-  'conditions': [
-    ['OS!="ios"', {
-      'targets': [
-        {
-          # GN version: //components/plugins/renderer
-          'target_name': 'plugins_renderer',
-          'type': 'static_library',
-          'dependencies': [
-            '../gin/gin.gyp:gin',
-            '../skia/skia.gyp:skia',
-            '../third_party/WebKit/public/blink.gyp:blink',
-            '../third_party/re2/re2.gyp:re2',
-            '../v8/src/v8.gyp:v8',
-          ],
-          'include_dirs': [
-            '..',
-          ],
-          'sources': [
-            # Note: sources list duplicated in GN build.
-            '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',
-              ]
-            }],
-          ],
-        },
-      ],
-    }],
-  ],
-}