[Extensions] Remove the source_tab_id property on API request messages

extensions/browser/extension_function_dispatcher.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "extensions/browser/extension_function_dispatcher.h"
 
 #include <utility>
 
 #include "base/bind.h"
 #include "base/json/json_string_value_serializer.h"
@@ skipping 621 matching lines @@
   }
 
   function->SetArgs(&params.arguments);
   function->set_source_url(params.source_url);
   function->set_request_id(params.request_id);
   function->set_has_callback(params.has_callback);
   function->set_user_gesture(params.user_gesture);
   function->set_extension(extension);
   function->set_profile_id(profile_id);
   function->set_response_callback(callback);
-  function->set_source_tab_id(params.source_tab_id);
   function->set_source_context_type(
       process_map.GetMostLikelyContextType(extension, requesting_process_id));
   function->set_source_process_id(requesting_process_id);
 
   return function;
 }
 
 // static
 void ExtensionFunctionDispatcher::SendAccessDenied(
     const ExtensionFunction::ResponseCallback& callback,
     functions::HistogramValue histogram_value) {
   base::ListValue empty_list;
   callback.Run(ExtensionFunction::FAILED, empty_list,
                "Access to extension API denied.", histogram_value);
 }
 
 }  // namespace extensions