Introduce extensions_strings.grd

extensions/extensions_strings.gyp

 # 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.
 
 {
   'targets': [
     {
-      'target_name': 'components_strings',
+      'target_name': 'extensions_strings',
       'type': 'none',
       'actions': [
         {
-          'action_name': 'generate_components_strings',
+          'action_name': 'generate_extensions_strings',
           'variables': {
-            'grit_grd_file': 'components_strings.grd',
-            'grit_out_dir': '<(SHARED_INTERMEDIATE_DIR)/components/strings',
+            'grit_grd_file': 'extensions_strings.grd',
+            'grit_out_dir': '<(SHARED_INTERMEDIATE_DIR)/extensions/strings',
           },
           'includes': [ '../build/grit_action.gypi' ],
         },
       ],
       'direct_dependent_settings': {
         'include_dirs': [
-          '<(SHARED_INTERMEDIATE_DIR)/components/strings',
+          '<(SHARED_INTERMEDIATE_DIR)/extensions/strings',
         ],
       },
+      # This target generates extensions_strings.h so it must be built before
+      # targets that depend on it.
       'hard_dependency': 1,
     },
   ],
 }