Fix crash around Reset function call.

chrome/browser/chromeos/input_method/ibus_controller_impl.cc

 // Copyright (c) 2012 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/chromeos/input_method/ibus_controller_impl.h"
 
 #include <algorithm>  // for std::reverse.
 #include <cstdio>
 #include <cstring>  // for std::strcmp.
 #include <set>
@@ skipping 228 matching lines @@
     return StartIBusDaemon();
   }
   return true;
 }
 
 void IBusControllerImpl::Reset() {
   if (!IBusConnectionsAreAlive())
     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();
 }
 
 bool IBusControllerImpl::Stop() {
   if (ibus_daemon_status_ == IBUS_DAEMON_SHUTTING_DOWN ||
       ibus_daemon_status_ == IBUS_DAEMON_STOP) {
     return true;
   }
 
   ibus_daemon_status_ = IBUS_DAEMON_SHUTTING_DOWN;
@@ skipping 344 matching lines @@
 
 // static
 bool IBusControllerImpl::FindAndUpdatePropertyForTesting(
     const chromeos::input_method::InputMethodProperty& new_prop,
     chromeos::input_method::InputMethodPropertyList* prop_list) {
   return FindAndUpdateProperty(new_prop, prop_list);
 }
 
 }  // namespace input_method
 }  // namespace chromeos