Do not use ui::GetCharacterFromXEvent when Control is pressed.

ui/base/ime/input_method_ibus.cc

 // Copyright (c) 2011 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 "ui/base/ime/input_method_ibus.h"
 
 #include <ibus.h>
 
 #include <X11/X.h>
 #include <X11/Xlib.h>
@@ skipping 635 matching lines @@
     return;
   }
 
   // If a key event was not filtered by |context_| and |character_composer_|,
   // then it means the key event didn't generate any result text. So we need
   // to send corresponding character to the focused text input client.
   client = GetTextInputClient();
 
   const uint32 state =
       EventFlagsFromXFlags(GetKeyEvent(native_event)->state);
-  uint16 ch = ui::GetCharacterFromXEvent(native_event);
+  uint16 ch = 0;
+  if (!(state & ui::EF_CONTROL_DOWN))
+    ch = ui::GetCharacterFromXEvent(native_event);
   if (!ch) {
     ch = ui::GetCharacterFromKeyCode(
         ui::KeyboardCodeFromNative(native_event), state);
   }
 
   if (client && ch)
     client->InsertChar(ch, state);
 }
 
 void InputMethodIBus::ProcessUnfilteredFabricatedKeyPressEvent(
@@ skipping 272 matching lines @@
   DCHECK_EQ(GetIBus(), bus);
   DCHECK(data);
   IBusInputContext* ic =
       ibus_bus_create_input_context_async_finish(bus, res, NULL);
   if (ic)
     data->StoreOrAbandonInputContext(ic);
   delete data;
 }
 
 }  // namespace ui