Fix "notificiation" and "soruce" typos.

ios/chrome/extension_repack.gni

 # Copyright 2016 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("//tools/grit/repack.gni")
 
 # Pack all resources for an application extension for a given locale.
 #
 # Arguments:
 #
@@ skipping 39 matching lines @@
     ]
 
     output = "$target_gen_dir/${invoker.output_locale}.lproj/locale.pak"
     if (invoker.copy_data_to_bundle) {
       bundle_output = "{{bundle_resources_dir}}/" +
                       "${invoker.output_locale}.lproj/locale.pak"
     }
   }
 }
 
-# Pack all resoruces for an application extension for all locales.
+# Pack all resources for an application extension for all locales.
 #
 # Arguments:
 #
 #   extension [required]
 #       name of the application extension.
 #
 #   input_locales [required]
 #       list of all locales to pack.
 #
 #   output_locales [required]
@@ skipping 45 matching lines @@
 
     _locale_targets += [ ":$_locale_target" ]
     _current_locale = _current_locale + 1
   }
 
   group(_target_name) {
     forward_variables_from(invoker, [ "visibility" ])
     public_deps = _locale_targets
   }
 }