Remove unused ShelfModelObserver::ShelfStatusChanged()

chrome/browser/ui/ash/launcher/chrome_launcher_controller_unittest.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/ui/ash/launcher/chrome_launcher_controller.h"
 
 #include <stddef.h>
 #include <algorithm>
 #include <set>
 #include <string>
@@ skipping 111 matching lines @@
 
   void ShelfItemChanged(int index, const ash::ShelfItem& old_item) override {
     ++changed_;
     last_index_ = index;
   }
 
   void ShelfItemMoved(int start_index, int target_index) override {
     last_index_ = target_index;
   }
 
-  void ShelfStatusChanged() override {}
-
   void clear_counts() {
     added_ = 0;
     removed_ = 0;
     changed_ = 0;
     last_index_ = 0;
   }
 
   int added() const { return added_; }
   int removed() const { return removed_; }
   int changed() const { return changed_; }
@@ skipping 2713 matching lines @@
   EXPECT_EQ(1, app_icon_loader1->clear_count());
   EXPECT_EQ(1, app_icon_loader2->fetch_count());
   EXPECT_EQ(1, app_icon_loader2->clear_count());
 
   launcher_controller_->CloseLauncherItem(shelfId3);
   EXPECT_EQ(1, app_icon_loader1->fetch_count());
   EXPECT_EQ(1, app_icon_loader1->clear_count());
   EXPECT_EQ(1, app_icon_loader2->fetch_count());
   EXPECT_EQ(1, app_icon_loader2->clear_count());
 }