Remove content/public/plugin and chrome/plugin

content/shell/BUILD.gn

 # Copyright 2014 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.
 
 import("//build/config/features.gni")
 import("//build/config/sanitizers/sanitizers.gni")
 import("//build/config/ui.gni")
 import("//build/config/win/console_app.gni")
 import("//build/config/win/manifest.gni")
 import("//media/media_options.gni")
@@ skipping 182 matching lines @@
     "//third_party/WebKit/public:debug_devtools",
   ]
 
   defines = [ "CONTENT_SHELL_VERSION=\"$content_shell_version\"" ]
 
   public_deps = [
     # This exposes all public content APIs.
     "//content/public/app:both",
     "//content/public/browser",
     "//content/public/common",
-    "//content/public/plugin",
     "//content/public/renderer",
     "//content/public/utility",
   ]
   deps = [
     ":mojo_bindings",
     ":resources",
     "//base",
     "//base:base_static",
     "//base/third_party/dynamic_annotations",
     "//cc",
@@ skipping 310 matching lines @@
       ":content_shell_lib",
     ]
   }
 }
 
 mojom("mojo_bindings") {
   sources = [
     "common/layout_test/layout_test_bluetooth_fake_adapter_setter.mojom",
   ]
 }