[Extensions] Remove the source_tab_id property on API request messages

extensions/browser/extension_function.cc

 // Copyright 2013 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.h"
 
 #include <utility>
 
 #include "base/logging.h"
 #include "base/macros.h"
@@ skipping 253 matching lines @@
 
 ExtensionFunction::ExtensionFunction()
     : request_id_(-1),
       profile_id_(NULL),
       name_(""),
       has_callback_(false),
       include_incognito_(false),
       user_gesture_(false),
       bad_message_(false),
       histogram_value_(extensions::functions::UNKNOWN),
-      source_tab_id_(-1),
       source_context_type_(Feature::UNSPECIFIED_CONTEXT),
       source_process_id_(-1),
       did_respond_(false) {}
 
 ExtensionFunction::~ExtensionFunction() {
 }
 
 UIThreadExtensionFunction* ExtensionFunction::AsUIThreadExtensionFunction() {
   return NULL;
 }
@@ skipping 331 matching lines @@
 void AsyncExtensionFunction::SendResponse(bool success) {
   ResponseValue response;
   if (success) {
     response = ArgumentList(std::move(results_));
   } else {
     response = results_ ? ErrorWithArguments(std::move(results_), error_)
                         : Error(error_);
   }
   Respond(std::move(response));
 }