Notifies the IME extension for IME ready with onActivate/onFocus events at start.

chrome/browser/extensions/api/input_ime/input_ime_api_nonchromeos.cc

 // Copyright 2015 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.
 
 // This file is for non-chromeos (win & linux) functions, such as
 // chrome.input.ime.activate, chrome.input.ime.createWindow and
 // chrome.input.ime.onSelectionChanged.
 // TODO(azurewei): May refactor the code structure by using delegate or
 // redesign the API to remove this platform-specific file in the future.
 
@@ skipping 124 matching lines @@
 
 void InputImeAPI::OnExtensionUnloaded(content::BrowserContext* browser_context,
                                       const Extension* extension,
                                       UnloadedExtensionInfo::Reason reason) {
   InputImeEventRouter* event_router =
       GetInputImeEventRouter(Profile::FromBrowserContext(browser_context));
   if (event_router)
     event_router->DeleteInputMethodEngine(extension->id());
 }
 
-void InputImeAPI::OnListenerAdded(const EventListenerInfo& details) {}
-
 InputImeEventRouter::InputImeEventRouter(Profile* profile)
     : InputImeEventRouterBase(profile), active_engine_(nullptr) {}
 
 InputImeEventRouter::~InputImeEventRouter() {
   if (active_engine_)
     DeleteInputMethodEngine(active_engine_->GetExtensionId());
 }
 
 InputMethodEngineBase* InputImeEventRouter::GetActiveEngine(
     const std::string& extension_id) {
@@ skipping 209 matching lines @@
     return RespondNow(Error(kErrorNoActiveEngine));
 
   scoped_ptr<api::input_ime::HideWindow::Params> params(
       api::input_ime::HideWindow::Params::Create(*args_));
   EXTENSION_FUNCTION_VALIDATE(params.get());
   engine->HideImeWindow(params->window_id);
   return RespondNow(NoArguments());
 }
 
 }  // namespace extensions