Make the root_namespace argument to json_schema_compiler.gypi a string

tools/json_schema_compiler/features_h_generator.py

 # Copyright 2013 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 os.path
 
 from code import Code
 import cpp_util
 
 
@@ skipping 14 matching lines @@
 
   def Generate(self):
     """Generates a Code object for features.
     """
     c = Code()
     (c.Append(cpp_util.CHROMIUM_LICENSE)
       .Append()
       .Append(cpp_util.GENERATED_FEATURE_MESSAGE % self._source_file)
       .Append()
     )
-    ifndef_name = cpp_util.GenerateIfndefName(self._source_file_filename,
-                                              self._class_name)
+
+    # Hack: for the purpose of gyp the header file will always be the source
+    # file with its file extension replaced by '.h'. Assume so.
+    output_file = os.path.splitext(self._namespace.source_file)[0] + '.h'
+    ifndef_name = cpp_util.GenerateIfndefName(output_file)
+
     (c.Append('#ifndef %s' % ifndef_name)
       .Append('#define %s' % ifndef_name)
       .Append()
     )
 
     (c.Append('#include <map>')
       .Append('#include <string>')
       .Append()
       .Concat(cpp_util.OpenNamespace(self._namespace))
       .Append()
@@ skipping 39 matching lines @@
     c = Code()
 
     (c.Sblock()
       .Append('kUnknown,')
     )
     for feature in self._feature_defs:
       c.Append('%s,' % cpp_util.ConstantName(feature.name))
     c.Append('kEnumBoundary')
 
     return c