Fix crash bug of IME extension API.

chrome/browser/chromeos/input_method/input_method_engine_ibus.cc

Index: chrome/browser/chromeos/input_method/input_method_engine_ibus.cc
diff --git a/chrome/browser/chromeos/input_method/input_method_engine_ibus.cc b/chrome/browser/chromeos/input_method/input_method_engine_ibus.cc
index 1ca9cf74d418e6a99fd085d9360f903528126227..2af7f8bb3c90a96adcb90d7e2294d20f6bd3cacf 100644
--- a/chrome/browser/chromeos/input_method/input_method_engine_ibus.cc
+++ b/chrome/browser/chromeos/input_method/input_method_engine_ibus.cc
@@ -55,6 +55,12 @@ InputMethodEngineIBus::InputMethodEngineIBus()
       weak_ptr_factory_(this) {
 }
 
+InputMethodEngineIBus::~InputMethodEngineIBus() {
+  GetCurrentService()->UnsetEngine();
+  input_method::InputMethodManager::GetInstance()->
+      RemoveInputMethodExtension(ibus_id_);
+}
+
 void InputMethodEngineIBus::Initialize(
     InputMethodEngine::Observer* observer,
     const char* engine_name,
@@ -110,9 +116,6 @@ void InputMethodEngineIBus::Initialize(
     RegisterComponent();
 }
 
-InputMethodEngineIBus::~InputMethodEngineIBus() {
-}
-
 bool InputMethodEngineIBus::SetComposition(
     int context_id,
     const char* text,
@@ -571,7 +574,7 @@ void InputMethodEngineIBus::CreateEngineHandler(
   current_object_path_++;
   object_path_ = dbus::ObjectPath(kObjectPathPrefix +
                                   base::IntToString(current_object_path_));
-  GetCurrentService()->Initialize(this);
+  GetCurrentService()->SetEngine(this);
   sender.Run(object_path_);
 }