Check the IME component extension's availability on linux_chromeos, so that system fallback VK can …

chrome/browser/chromeos/input_method/component_extension_ime_manager_impl.h

 // 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.
 
 #ifndef CHROME_BROWSER_CHROMEOS_INPUT_METHOD_COMPONENT_EXTENSION_IME_MANAGER_IMPL_H_
 #define CHROME_BROWSER_CHROMEOS_INPUT_METHOD_COMPONENT_EXTENSION_IME_MANAGER_IMPL_H_
 
 #include <set>
 #include <vector>
 
@@ skipping 10 matching lines @@
 
 // The implementation class of ComponentExtensionIMEManagerDelegate.
 class ComponentExtensionIMEManagerImpl
     : public ComponentExtensionIMEManagerDelegate {
  public:
   ComponentExtensionIMEManagerImpl();
   virtual ~ComponentExtensionIMEManagerImpl();
 
   // ComponentExtensionIMEManagerDelegate overrides:
   virtual std::vector<ComponentExtensionIME> ListIME() OVERRIDE;
-  virtual bool Load(Profile* profile,
+  virtual void Load(Profile* profile,
                     const std::string& extension_id,
                     const std::string& manifest,
                     const base::FilePath& file_path) OVERRIDE;
   virtual void Unload(Profile* profile,
                       const std::string& extension_id,
                       const base::FilePath& file_path) OVERRIDE;
 
  private:
   // Reads component extensions and extract their localized information: name,
   // description and ime id. This function fills them into |out_imes|.
@@ skipping 14 matching lines @@
   // kInputComponents key from manifest. This function returns true on success,
   // otherwise retrun false. This function must be called on FILE thread.
   static bool ReadEngineComponent(
       const ComponentExtensionIME& component_extension,
       const base::DictionaryValue& dict,
       ComponentExtensionEngine* out);
 
   // The list of component extension IME.
   std::vector<ComponentExtensionIME> component_extension_list_;
 
-  // For checking the function should be called on UI thread.
-  base::ThreadChecker thread_checker_;
-  base::WeakPtrFactory<ComponentExtensionIMEManagerImpl> weak_ptr_factory_;
-
   DISALLOW_COPY_AND_ASSIGN(ComponentExtensionIMEManagerImpl);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_INPUT_METHOD_COMPONENT_EXTENSION_IME_MANAGER_IMPL_H_