Fix bug where content scripts can get GC'd if they don't attach

chrome/renderer/extensions/bindings_utils.cc

Index: chrome/renderer/extensions/bindings_utils.cc
diff --git a/chrome/renderer/extensions/bindings_utils.cc b/chrome/renderer/extensions/bindings_utils.cc
index d96f8d771b5b9aee01480f8bc25b9cf76775f766..ddccf2c115e07aa0c1ee5565420a9c9cb584fa97 100644
--- a/chrome/renderer/extensions/bindings_utils.cc
+++ b/chrome/renderer/extensions/bindings_utils.cc
@@ -71,6 +71,15 @@ ContextList GetContextsForExtension(const std::string& extension_id) {
   return contexts;
 }
 
+ContextInfo* GetInfoForCurrentContext() {
+  v8::Local<v8::Context> context = v8::Context::GetCurrent();
+  ContextList::iterator context_iter = FindContext(context);
+  if (context_iter == GetContexts().end())
+    return NULL;
+  else
+    return context_iter->get();
+}
+
 ContextList::iterator FindContext(v8::Handle<v8::Context> context) {
   ContextList& all_contexts = GetContexts();