Extensions: Split extensions utility IPC messages into its own file.

chrome/chrome_tests_unit.gypi

Index: chrome/chrome_tests_unit.gypi
diff --git a/chrome/chrome_tests_unit.gypi b/chrome/chrome_tests_unit.gypi
index 7dcd69cb771b19e2e254873d1dad15aa059d9585..92930ac7fbb1f482d74c777733761ea1ecedb3fd 100644
--- a/chrome/chrome_tests_unit.gypi
+++ b/chrome/chrome_tests_unit.gypi
@@ -2125,12 +2125,17 @@
             ['exclude', '^common/extensions/manifest_tests/'],
             # This test depends on manifest_tests.
             ['exclude', '^common/extensions/permissions/settings_override_permission_unittest.cc'],
+            ['exclude', '^utility/extensions/'],
+            ['exclude', '^utility/image_writer/'],
+            ['exclude', '^utility/media_galleries/'],
           ],
           'sources!': [
             '../extensions/renderer/activity_log_converter_strategy_unittest.cc',
             'browser/extensions/active_script_controller_unittest.cc',
             'browser/extensions/active_tab_unittest.cc',
             'browser/extensions/extension_context_menu_model_unittest.cc',
+            'browser/extensions/extension_service_unittest.cc',
+            'browser/extensions/extension_error_controller_unittest.cc',
             'browser/extensions/extension_ui_unittest.cc',
             'browser/extensions/extension_web_ui_unittest.cc',
             'browser/extensions/menu_manager_unittest.cc',
@@ -2138,6 +2143,9 @@
             'browser/extensions/page_action_controller_unittest.cc',
             'browser/extensions/permissions_updater_unittest.cc',
             'browser/extensions/sandboxed_unpacker_unittest.cc',
+            'browser/extensions/updater/extension_updater_unittest.cc',
+            'browser/extensions/webstore_inline_installer_unittest.cc',
+            'browser/extensions/webstore_installer_unittest.cc',
             'browser/guest_view/guest_view_manager_unittest.cc',
             'browser/web_applications/web_app_unittest.cc',
             'common/extensions/sync_type_unittest.cc',
@@ -2149,7 +2157,6 @@
             'renderer/extensions/module_system_unittest.cc',
             'renderer/extensions/renderer_permissions_policy_delegate_unittest.cc',
             'renderer/extensions/safe_builtins_unittest.cc',
-            'utility/extensions/unpacker_unittest.cc',
           ],
         }],
         ['use_ash==1', {