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

Source/devtools/scripts/concatenate_application_code.py

Index: Source/devtools/scripts/concatenate_application_code.py
diff --git a/Source/devtools/scripts/concatenate_application_code.py b/Source/devtools/scripts/concatenate_application_code.py
index efcdbc9899f64b30a83d7bad87c469f15fbfc374..60e5442eef620587d3a0522a722faecb8701b5b1 100755
--- a/Source/devtools/scripts/concatenate_application_code.py
+++ b/Source/devtools/scripts/concatenate_application_code.py
@@ -152,8 +152,12 @@ class ReleaseBuilder(AppBuilder):
             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)