DevTools: Remove the "stylesheets" field from module descriptors at build time

Source/devtools/scripts/concatenate_application_code.py

 #!/usr/bin/env python
 #
 # 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.
 
 """
 Release:
   - Concatenates autostart modules, application modules' module.json descriptors,
     and the application loader into a single script.
@@ skipping 134 matching lines @@
         else:
             assert resource_path
 
     def _release_module_descriptors(self):
         module_descriptors = self.descriptors.modules
         result = []
         for name in module_descriptors:
             module = copy.copy(module_descriptors[name])
             # Clear scripts, as they are not used at runtime
             # (only the fact of their presence is important).
-            if module.get('scripts'):
+            stylesheets = module.get('stylesheets', None)
+            if module.get('scripts') or stylesheets:
                 module['scripts'] = []
+            # Stylesheets list is not used at runtime.
+            if stylesheets is not None:
+                del module['stylesheets']
             result.append(module)
         return json.dumps(result)
 
     def _write_module_css_styles(self, css_names, output):
         for css_name in css_names:
             css_name = path.normpath(css_name).replace('\\', '/')
             output.write('Runtime.cachedResources["%s"] = "' % css_name)
             css_content = read_file(path.join(self.application_dir, css_name)) + css_source_url(css_name)
             css_content = css_content.replace('\\', '\\\\')
             css_content = css_content.replace('\n', '\\n')
@@ skipping 94 matching lines @@
         hardlink_or_copy_file(join(self.application_dir, html_name), join(self.output_dir, html_name), True)
 
 
 def build_application(application_name, loader, application_dir, output_dir, release_mode):
     descriptors = loader.load_application(application_name + '.json')
     if release_mode:
         builder = ReleaseBuilder(application_name, descriptors, application_dir, output_dir)
     else:
         builder = DebugBuilder(application_name, descriptors, application_dir, output_dir)
     builder.build_app()