Remove unused ash::SHELF_ALIGNMENT_TOP

chrome/browser/ui/ash/launcher/chrome_launcher_controller.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 <vector>
 
@@ skipping 234 matching lines @@
   // See comment in |kShelfAlignment| as to why we consider two prefs.
   const std::string alignment_value(
       GetPrefForRootWindow(profile->GetPrefs(),
                            root_window,
                            prefs::kShelfAlignmentLocal,
                            prefs::kShelfAlignment));
   if (alignment_value == ash::kShelfAlignmentLeft)
     return ash::SHELF_ALIGNMENT_LEFT;
   else if (alignment_value == ash::kShelfAlignmentRight)
     return ash::SHELF_ALIGNMENT_RIGHT;
-  else if (alignment_value == ash::kShelfAlignmentTop)
-    return ash::SHELF_ALIGNMENT_TOP;
+  // Default to bottom.
   return ash::SHELF_ALIGNMENT_BOTTOM;
 }
 
 // If prefs have synced and no user-set value exists at |local_path|, the value
 // from |synced_path| is copied to |local_path|.
 void MaybePropagatePrefToLocal(
     syncable_prefs::PrefServiceSyncable* pref_service,
     const char* local_path,
     const char* synced_path) {
   if (!pref_service->FindPreference(local_path)->HasUserSetting() &&
@@ skipping 1022 matching lines @@
   switch (ash::Shell::GetInstance()->GetShelfAlignment(root_window)) {
     case ash::SHELF_ALIGNMENT_BOTTOM:
       pref_value = ash::kShelfAlignmentBottom;
       break;
     case ash::SHELF_ALIGNMENT_LEFT:
       pref_value = ash::kShelfAlignmentLeft;
       break;
     case ash::SHELF_ALIGNMENT_RIGHT:
       pref_value = ash::kShelfAlignmentRight;
       break;
-    case ash::SHELF_ALIGNMENT_TOP:
-      pref_value = ash::kShelfAlignmentTop;
   }
 
   UpdatePerDisplayPref(
       profile_->GetPrefs(), root_window, prefs::kShelfAlignment, pref_value);
 
   if (root_window == ash::Shell::GetPrimaryRootWindow()) {
     // See comment in |kShelfAlignment| about why we have two prefs here.
     profile_->GetPrefs()->SetString(prefs::kShelfAlignmentLocal, pref_value);
     profile_->GetPrefs()->SetString(prefs::kShelfAlignment, pref_value);
   }
@@ skipping 930 matching lines @@
 
 AppIconLoader* ChromeLauncherController::GetAppIconLoaderForApp(
     const std::string& app_id) {
   for (const auto& app_icon_loader : app_icon_loaders_) {
     if (app_icon_loader->CanLoadImageForApp(app_id))
       return app_icon_loader.get();
   }
 
   return nullptr;
 }