Remove content/public/plugin and chrome/plugin

chrome/chrome.gyp

 # Copyright (c) 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': {
     'chromium_code': 1,
 
     # Define the common dependencies that contain all the actual
     # Chromium functionality.  This list gets pulled in below by
     # the link of the actual chrome (or chromium) executable on
@@ skipping 14 matching lines @@
     'grit_out_dir': '<(SHARED_INTERMEDIATE_DIR)/chrome',
     'protoc_out_dir': '<(SHARED_INTERMEDIATE_DIR)/protoc_out',
     'conditions': [
       ['OS!="ios"', {
         'chromium_browser_dependencies': [
           'debugger',
           '../ppapi/ppapi_internal.gyp:ppapi_host',
         ],
         'chromium_child_dependencies': [
           'child',
-          'plugin',
           'renderer',
           'utility',
           '../content/content.gyp:content_gpu',
           '../content/content.gyp:content_ppapi_plugin',
           '../third_party/WebKit/public/blink_devtools.gyp:blink_devtools_frontend_resources',
         ],
         'conditions': [
           [ 'cld_version==0 or cld_version==2', {
             'chromium_child_dependencies': [
               # Use whatever CLD2 data access mode that the application
@@ skipping 61 matching lines @@
   ],
   'conditions': [
     ['OS!="ios"', {
       'includes': [
         '../apps/apps.gypi',
         'chrome_child.gypi',
         'chrome_debugger.gypi',
         'chrome_dll.gypi',
         'chrome_exe.gypi',
         'chrome_installer.gypi',
-        'chrome_plugin.gypi',
         'chrome_renderer.gypi',
         'chrome_tests.gypi',
         'chrome_tests_unit.gypi',
         'chrome_utility.gypi',
         'policy_templates.gypi',
       ],
       'targets': [
         {
           # GN version: //chrome/browser/extensions/default_extensions
           'target_name': 'default_extensions',
@@ skipping 682 matching lines @@
                 # expired. crbug.com/577698
                 '../components/components.gyp:startup_metric_utils_common',
               ],
             }],
           ],
         },
       ],
     }],
   ],  # 'conditions'
 }