Convert utility process extension Unpacker IPC to mojo

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("//extensions/features/features.gni")
 import("//mojo/public/tools/bindings/mojom.gni")
 
 source_set("common_constants") {
   sources = [
     "constants.cc",
     "constants.h",
   ]
 
   # TODO(jschuh): crbug.com/167187 fix size_t to int truncations.
   configs += [ "//build/config/compiler:no_size_t_to_int_warning" ]
 }
 
 if (enable_extensions) {
   mojom("mojo") {
     sources = [
+      "extension_unpacker.mojom",
       "mojo/keep_alive.mojom",
     ]
+
     if (proprietary_codecs && enable_wifi_display) {
       sources += [ "mojo/wifi_display_session_service.mojom" ]
     }
+
+    public_deps = [
+      "//mojo/common:common_custom_types",
+    ]
   }
 
   # This must be a static library because extensions common depends on
   # GetTrustedICAPublicKey in extensions/browser which isn't always linked
   # in. TODO(brettw): This reverse dependency should be fixed.
   static_library("common") {
     sources = [
       "alias.h",
       "api/bluetooth/bluetooth_manifest_data.cc",
       "api/bluetooth/bluetooth_manifest_data.h",
@@ skipping 333 matching lines @@
       "//ui/base",
       "//ui/gfx",
       "//url",
     ]
 
     if (is_chromeos) {
       sources += [ "manifest_handlers/action_handlers_handler_unittest.cc" ]
     }
   }
 }  # enable_extensions