Move Cast certificate verification code from extensions to components.

extensions/browser/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("//extensions/extensions.gni")
 
 # GYP version: extensions/extensions.gyp:extensions_browser
 source_set("browser") {
   sources = []
 
   deps = [
     "//base:i18n",
+    "//components/cast_certificate",
     "//components/guest_view/browser",
     "//components/keyed_service/content",
     "//components/keyed_service/core",
     "//components/pref_registry",
     "//components/sessions",
     "//components/ui/zoom",
     "//components/update_client",
     "//components/version_info",
     "//components/web_cache/browser",
     "//components/web_modal",
@@ skipping 81 matching lines @@
       if (proprietary_codecs && enable_wifi_display) {
         wifi_display_sources = rebase_path(
                 extensions_gypi_values.extensions_browser_sources_wifi_display,
                 ".",
                 "//extensions")
         sources += wifi_display_sources
       }
     }
   }
 }