Make functions being routed by NativeHandlers throw an exception if there is no ModuleSystem in the…

chrome/renderer/module_system.h

Index: chrome/renderer/module_system.h
diff --git a/chrome/renderer/module_system.h b/chrome/renderer/module_system.h
index 1dc6065a9b472a107edaf021a3a4ba295bdd486d..c68137a073cfffb93b23a4445602f345e5ac1d6c 100644
--- a/chrome/renderer/module_system.h
+++ b/chrome/renderer/module_system.h
@@ -54,6 +54,9 @@ class ModuleSystem : public NativeHandler {
   explicit ModuleSystem(v8::Handle<v8::Context> context, SourceMap* source_map);
   virtual ~ModuleSystem();
 
+  // Returns true if the current context has a ModuleSystem installed in it.
+  static bool IsPresentInCurrentContext();
+
   // Require the specified module. This is the equivalent of calling
   // require('module_name') from the loaded JS files.
   void Require(const std::string& module_name);