Make DETECT_IMPORTANT_CONTENT the default Plugins content setting based

components/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/ui.gni")
 import("//testing/test.gni")
 import("//tools/grit/repack.gni")
 
 # Collection of all components. You wouldn't link to this, but this is rather
@@ skipping 52 matching lines @@
     "//components/onc",
     "//components/os_crypt",
     "//components/packed_ct_ev_whitelist",
     "//components/pairing",
     "//components/password_manager/content/browser",
     "//components/password_manager/core/browser",
     "//components/password_manager/core/common",
     "//components/pdf/browser",
     "//components/pdf/common",
     "//components/pdf/renderer",
+    "//components/plugins/common",
     "//components/plugins/renderer",
     "//components/policy",
     "//components/power",
     "//components/precache/core",
     "//components/precache/content",
     "//components/pref_registry",
     "//components/proximity_auth",
     "//components/proximity_auth/cryptauth",
     "//components/query_parser",
     "//components/rappor",
@@ skipping 285 matching lines @@
   configs += [ "//build/config/compiler:no_size_t_to_int_warning" ]
 
   deps = [
     "//base",
     "//base/test:test_support_perf",
     "//testing/gtest",
     "//content/test:test_support",
     "//components/visitedlink/browser",
   ]
 }