[Panel refactor] Deprecate old panels.

chrome/browser/extensions/api/tabs/tabs.cc

 // Copyright (c) 2012 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.h"
 
 #include <algorithm>
 #include <limits>
 #include <vector>
 
@@ skipping 559 matching lines @@
     }
 
     if (args->HasKey(keys::kFocusedKey)) {
       EXTENSION_FUNCTION_VALIDATE(args->GetBoolean(keys::kFocusedKey,
                                                    &focused));
       saw_focus_key = true;
     }
   }
 
 #if !defined(USE_ASH)
-  if (window_type == Browser::TYPE_PANEL &&
-      PanelManager::UseBrowserlessPanels()) {
+  if (window_type == Browser::TYPE_PANEL) {
     std::string title =
         web_app::GenerateApplicationNameFromExtensionId(extension_id);
     // Note: Panels ignore all but the first url provided.
     Panel* panel = PanelManager::GetInstance()->CreatePanel(
         title, window_profile, urls[0], window_bounds, panel_create_mode);
 
     // Unlike other window types, Panels do not take focus by default.
     if (!saw_focus_key || !focused)
       panel->ShowInactive();
     else
       panel->Show();
 
     SetResult(
         panel->extension_window_controller()->CreateWindowValueWithTabs(
             GetExtension()));
     return true;
   }
-  // else fall through to create BrowserWindow
 #endif
 
   // Create a new BrowserWindow.
   Browser::CreateParams create_params(window_type, window_profile);
   if (extension_id.empty()) {
     create_params.initial_bounds = window_bounds;
   } else {
     create_params = Browser::CreateParams::CreateForApp(
         window_type,
         web_app::GenerateApplicationNameFromExtensionId(extension_id),
@@ skipping 1253 matching lines @@
   // called for every API call the extension made.
   GotLanguage(language);
 }
 
 void DetectTabLanguageFunction::GotLanguage(const std::string& language) {
   SetResult(Value::CreateStringValue(language.c_str()));
   SendResponse(true);
 
   Release();  // Balanced in Run()
 }