Remove some useless code in TabsEventRouter.

chrome/browser/extensions/api/tabs/tabs_event_router.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 "chrome/browser/extensions/api/tabs/tabs_event_router.h"
 
 #include <stddef.h>
 
 #include <memory>
 #include <utility>
@@ skipping 489 matching lines @@
                 events::TABS_ON_REPLACED, tabs::OnReplaced::kEventName,
                 std::move(args), EventRouter::USER_GESTURE_UNKNOWN);
 
   UnregisterForTabNotifications(old_contents);
 
   if (!GetTabEntry(new_contents))
     RegisterForTabNotifications(new_contents);
 }
 
 void TabsEventRouter::TabPinnedStateChanged(WebContents* contents, int index) {
-  TabStripModel* tab_strip = NULL;
-  int tab_index;
-
-  if (ExtensionTabUtil::GetTabStripModel(contents, &tab_strip, &tab_index)) {
-    std::set<std::string> changed_property_names;
-    changed_property_names.insert(tabs_constants::kPinnedKey);
-    DispatchTabUpdatedEvent(contents, std::move(changed_property_names));
-  }
+  std::set<std::string> changed_property_names;
+  changed_property_names.insert(tabs_constants::kPinnedKey);
+  DispatchTabUpdatedEvent(contents, std::move(changed_property_names));
 }
 
 void TabsEventRouter::OnZoomChanged(
     const ZoomController::ZoomChangedEventData& data) {
   DCHECK(data.web_contents);
   int tab_id = ExtensionTabUtil::GetTabId(data.web_contents);
   if (tab_id < 0)
     return;
 
   // Prepare the zoom change information.
@@ skipping 23 matching lines @@
     const gfx::Image& image) {
   if (notification_icon_type == NON_TOUCH_16_DIP && icon_url_changed) {
     favicon::ContentFaviconDriver* content_favicon_driver =
         static_cast<favicon::ContentFaviconDriver*>(favicon_driver);
     FaviconUrlUpdated(content_favicon_driver->web_contents());
   }
 }
 
 void TabsEventRouter::OnDiscardedStateChange(WebContents* contents,
                                              bool is_discarded) {
-  TabStripModel* tab_strip = nullptr;
-  int tab_index = -1;
-
-  if (ExtensionTabUtil::GetTabStripModel(contents, &tab_strip, &tab_index)) {
-    std::set<std::string> changed_property_names;
-    changed_property_names.insert(tabs_constants::kDiscardedKey);
-    DispatchTabUpdatedEvent(contents, std::move(changed_property_names));
-  }
+  std::set<std::string> changed_property_names;
+  changed_property_names.insert(tabs_constants::kDiscardedKey);
+  DispatchTabUpdatedEvent(contents, std::move(changed_property_names));
 }
 
 void TabsEventRouter::OnAutoDiscardableStateChange(WebContents* contents,
                                                    bool is_auto_discardable) {
-  TabStripModel* tab_strip = nullptr;
-  int tab_index = -1;
-
-  if (ExtensionTabUtil::GetTabStripModel(contents, &tab_strip, &tab_index)) {
-    std::set<std::string> changed_property_names;
-    changed_property_names.insert(tabs_constants::kAutoDiscardableKey);
-    DispatchTabUpdatedEvent(contents, std::move(changed_property_names));
-  }
+  std::set<std::string> changed_property_names;
+  changed_property_names.insert(tabs_constants::kAutoDiscardableKey);
+  DispatchTabUpdatedEvent(contents, std::move(changed_property_names));
 }
 
 }  // namespace extensions