Do not dereference potentially invalid frame pointer.

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 0ed332c68f4744ee94b91f454247ec85f0c57c54..aa7d18e17bf5b6e971709841175b6bcda1f4ba31 100644
--- a/chrome/renderer/extensions/bindings_utils.cc
+++ b/chrome/renderer/extensions/bindings_utils.cc
@@ -129,11 +129,11 @@ v8::Handle<v8::Value> ExtensionBase::Print(const v8::Arguments& args) {
 }
 
 ContextInfo::ContextInfo(v8::Persistent<v8::Context> context,
-                         const std::string& extension_id,
-                         WebFrame* frame)
+                         v8::Persistent<v8::Context> main_world_context,
+                         const std::string& extension_id)
     : context(context),
+      main_world_context(main_world_context),
       extension_id(extension_id),
-      frame(frame),
       num_connected_events(0) {
 }