Fix crash around Reset function call.

There is timing issue around initialization, if the InputContext is initialized
after InputMethodManager, Reset function will be called with NULL object proxy.
This cause a crash. If the object proxy is not ready, calling Reset is not
necessary. So just doing nothing is fine.

BUG=174248
TEST=None


Review URL: https://chromiumcodereview.appspot.com/12223084

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@182147 0039d316-1c4b-4281-b951-d872f2087c98

chrome/browser/chromeos/input_method/ibus_controller_impl.cc

@@ -246,7 +246,9 @@ void IBusControllerImpl::Reset() {
     return;
   IBusInputContextClient* client
       = DBusThreadManager::Get()->GetIBusInputContextClient();
-  if (client)
+  // We don't need to call Reset if there is no on-going input context, because
+  // the input context will be reset at initialization.
+  if (client && client->IsObjectProxyReady())
     client->Reset();
 }