[Extensions] Remove RequestSender::ScopedTabID

extensions/renderer/request_sender.h

Index: extensions/renderer/request_sender.h
diff --git a/extensions/renderer/request_sender.h b/extensions/renderer/request_sender.h
index 4ffd90249032147542df5971b8ab6b57369cd0a3..b0749bfdffc4fff408749a6d1785847f77f8574d 100644
--- a/extensions/renderer/request_sender.h
+++ b/extensions/renderer/request_sender.h
@@ -47,20 +47,6 @@ class RequestSender {
                                     const std::string& error) = 0;
   };
 
-  // Helper class to (re)set the |source_tab_id_| below.
-  class ScopedTabID {
-   public:
-    ScopedTabID(RequestSender* request_sender, int tab_id);
-    ~ScopedTabID();
-
-   private:
-    RequestSender* const request_sender_;
-    const int tab_id_;
-    const int previous_tab_id_;
-
-    DISALLOW_COPY_AND_ASSIGN(ScopedTabID);
-  };
-
   RequestSender();
   virtual ~RequestSender();
 
@@ -108,8 +94,6 @@ class RequestSender {
 
   PendingRequestMap pending_requests_;
 
-  int source_tab_id_;  // Id of the tab sending the request, or -1 if no tab.
-
   DISALLOW_COPY_AND_ASSIGN(RequestSender);
 };