Make the root_namespace argument to json_schema_compiler.gypi a string

chrome/common/extensions/api/api.gyp

 # Copyright (c) 2012 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.
 
 {
   # All files are stored in these lists which are referenced in the target
   # below so that the GN build of this target can read in this dictionary and
   # duplicate the same logic without the lists getting out-of-sync. The GN
   # .gypi reader can not process conditions and does not know about targets,
   # etc., it just reads Python dictionaries.
@@ skipping 187 matching lines @@
               '<@(webrtc_schema_files)',
             ],
           }],
           ['branding=="Chrome" and chromeos==1', {
             'schema_files': [
               '<@(chromeos_branded_schema_files)',
             ],
           }],
         ],
         'cc_dir': 'chrome/common/extensions/api',
-        'root_namespace': 'extensions::api',
+        'root_namespace': 'extensions::api::%(namespace)s',
       },
       'dependencies': [
         # Different APIs include some headers from chrome/common that in turn
         # include generated headers from these targets.
         # TODO(brettw) this should be made unnecessary if possible.
         '<(DEPTH)/components/components.gyp:component_metrics_proto',
 
         '<(DEPTH)/content/content.gyp:content_browser',
         '<(DEPTH)/skia/skia.gyp:skia',
         '<(DEPTH)/sync/sync.gyp:sync',
       ],
       'conditions': [
         ['chromeos==1', {
           'dependencies': [
             '<(DEPTH)/chrome/chrome.gyp:drive_proto',
           ],
         }],
       ],
     },
   ],
 }