Move ZoomObserver, ZoomController and ZoomEventManager 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/crypto.gni")
 import("//build/config/features.gni")
 
 # GYP version: extensions/extensions.gyp:extensions_browser
 source_set("browser") {
   sources = []
@@ skipping 335 matching lines @@
       "extension_registry_observer.h",
       "extension_scoped_prefs.h",
       "extension_system.cc",
       "extension_system.h",
       "extension_system_provider.cc",
       "extension_system_provider.h",
       "extension_util.cc",
       "extension_util.h",
       "extension_web_contents_observer.cc",
       "extension_web_contents_observer.h",
+      "extension_zoom_request_client.cc",
+      "extension_zoom_request_client.h",
       "extensions_browser_client.cc",
       "extensions_browser_client.h",
       "external_provider_interface.h",
       "file_highlighter.cc",
       "file_highlighter.h",
       "file_reader.cc",
       "file_reader.h",
       "granted_file_entry.cc",
       "granted_file_entry.h",
       "guest_view/app_view/app_view_constants.cc",
@@ skipping 155 matching lines @@
         "api/vpn_provider/vpn_service.h",
         "api/vpn_provider/vpn_service_factory.h",
       ]
     }
   }
 
   if (is_win) {
     cflags = [ "/wd4267" ]  # TODO(jschuh): crbug.com/167187 fix size_t to int truncations.
   }
 }