Move extensions manifest handler for OAuth2 to //extensions

extensions/common/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("//mojo/public/tools/bindings/mojom.gni")
 
 mojom("mojo") {
   sources = [
     "stash.mojom",
@@ skipping 101 matching lines @@
     "manifest_handlers/file_handler_info.cc",
     "manifest_handlers/file_handler_info.h",
     "manifest_handlers/icons_handler.cc",
     "manifest_handlers/icons_handler.h",
     "manifest_handlers/incognito_info.cc",
     "manifest_handlers/incognito_info.h",
     "manifest_handlers/kiosk_mode_info.cc",
     "manifest_handlers/kiosk_mode_info.h",
     "manifest_handlers/launcher_page_info.cc",
     "manifest_handlers/launcher_page_info.h",
+    "manifest_handlers/oauth2_manifest_handler.cc",
+    "manifest_handlers/oauth2_manifest_handler.h",
     "manifest_handlers/offline_enabled_info.cc",
     "manifest_handlers/offline_enabled_info.h",
     "manifest_handlers/options_page_info.cc",
     "manifest_handlers/options_page_info.h",
     "manifest_handlers/permissions_parser.cc",
     "manifest_handlers/permissions_parser.h",
     "manifest_handlers/requirements_info.cc",
     "manifest_handlers/requirements_info.h",
     "manifest_handlers/sandboxed_page_info.cc",
     "manifest_handlers/sandboxed_page_info.h",
@@ skipping 130 matching lines @@
       "manifest_handlers/nacl_modules_handler.h",
     ]
   }
 
   if (is_win) {
     cflags = [
       "/wd4267", # TODO(jschuh): crbug.com/167187 fix size_t to int truncations.
     ]
   }
 }