[Extensions] Fix improper extension tab ownership bug

extensions/renderer/extension_frame_helper.cc

Index: extensions/renderer/extension_frame_helper.cc
diff --git a/extensions/renderer/extension_frame_helper.cc b/extensions/renderer/extension_frame_helper.cc
index bc54caa63c91710891e7213f7fde1cd0ce0bde40..394d07bc2b06e1460d2e86c1c6dc63461a8c1ee8 100644
--- a/extensions/renderer/extension_frame_helper.cc
+++ b/extensions/renderer/extension_frame_helper.cc
@@ -138,8 +138,6 @@ bool ExtensionFrameHelper::OnMessageReceived(const IPC::Message& message) {
     IPC_MESSAGE_HANDLER(ExtensionMsg_SetTabId, OnExtensionSetTabId)
     IPC_MESSAGE_HANDLER(ExtensionMsg_UpdateBrowserWindowId,
                         OnUpdateBrowserWindowId)
-    IPC_MESSAGE_HANDLER(ExtensionMsg_SetMainFrameExtensionOwner,
-                        OnSetMainFrameExtensionOwner)
     IPC_MESSAGE_HANDLER(ExtensionMsg_NotifyRenderViewType,
                         OnNotifyRendererViewType)
     IPC_MESSAGE_HANDLER(ExtensionMsg_Response, OnExtensionResponse)
@@ -190,11 +188,6 @@ void ExtensionFrameHelper::OnUpdateBrowserWindowId(int browser_window_id) {
   browser_window_id_ = browser_window_id;
 }
 
-void ExtensionFrameHelper::OnSetMainFrameExtensionOwner(
-    const std::string& extension_id) {
-  tab_extension_owner_id_ = extension_id;
-}
-
 void ExtensionFrameHelper::OnNotifyRendererViewType(ViewType type) {
   // TODO(devlin): It'd be really nice to be able to
   // DCHECK_EQ(VIEW_TYPE_INVALID, view_type_) here.