Fix the potential crash on ChromeOS.

chrome/browser/extensions/api/input_ime/input_ime_api_chromeos.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.
 
 #include "chrome/browser/extensions/api/input_ime/input_ime_api.h"
 
 #include <stddef.h>
 #include <utility>
 
 #include "base/macros.h"
@@ skipping 603 matching lines @@
   if (input_components && event_router) {
     event_router->RegisterImeExtension(extension->id(), *input_components);
   }
 }
 
 void InputImeAPI::OnExtensionUnloaded(content::BrowserContext* browser_context,
                                       const Extension* extension,
                                       UnloadedExtensionInfo::Reason reason) {
   const std::vector<InputComponentInfo>* input_components =
       InputComponents::GetInputComponents(extension);
+  if (!input_components || input_components->empty())
+    return;
   InputImeEventRouter* event_router =
       GetInputImeEventRouter(Profile::FromBrowserContext(browser_context));
-  if (input_components && !input_components->empty() && event_router) {
+  if (event_router) {
     event_router->UnregisterAllImes(extension->id());
   }
 }
 
 void InputImeAPI::OnListenerAdded(const EventListenerInfo& details) {
   if (!details.browser_context)
     return;
   InputMethodEngine* engine =
       GetActiveEngine(Profile::FromBrowserContext(details.browser_context),
                       details.extension_id);
   // Notifies the IME extension for IME ready with onActivate/onFocus events.
   if (engine)
     engine->Enable(engine->GetActiveComponentId());
 }
 
 }  // namespace extensions