Only deliver extension messages to contexts that care.

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 3cad5ea3714fe8625dc3706d669cceac8a4e62f2..066d1307cce8eb86e4075cec01e39725f7e845fb 100644
--- a/chrome/renderer/extensions/bindings_utils.cc
+++ b/chrome/renderer/extensions/bindings_utils.cc
@@ -38,6 +38,18 @@ ContextInfo::ContextInfo(v8::Persistent<v8::Context> context,
 
 ContextInfo::~ContextInfo() {}
 
+WebFrame* ContextInfo::GetWebFrame() const {
+  return WebFrame::frameForContext(context);
+}
+
+RenderView* ContextInfo::GetRenderView() const {
+  WebFrame* frame = GetWebFrame();
+  if (!frame || !frame->view())
+    return NULL;
+
+  return RenderView::FromWebView(frame->view());
+}
+
 ContextList& GetContexts() {
   return g_singleton_data.Get().contexts;
 }