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

chrome/renderer/module_system.cc

Index: chrome/renderer/module_system.cc
diff --git a/chrome/renderer/module_system.cc b/chrome/renderer/module_system.cc
index 53f12673e86894f117b1f970498f507dd2651158..7c246e41596344b70ee9ca3de9777a52efb8f98f 100644
--- a/chrome/renderer/module_system.cc
+++ b/chrome/renderer/module_system.cc
@@ -59,6 +59,12 @@ ModuleSystem::NativesEnabledScope::~NativesEnabledScope() {
   CHECK_GE(module_system_->natives_enabled_, 0);
 }
 
+// static
+bool ModuleSystem::IsPresentInCurrentContext() {
+  v8::Handle<v8::Object> global(v8::Context::GetCurrent()->Global());
+  return !global->GetHiddenValue(v8::String::New(kModuleSystem))->IsUndefined();
+}
+
 void ModuleSystem::Require(const std::string& module_name) {
   v8::HandleScope handle_scope;
   RequireForJsInner(v8::String::New(module_name.c_str()));