Extract Extension IME related utility.

chrome/browser/chromeos/input_method/ibus_controller_impl.cc

Index: chrome/browser/chromeos/input_method/ibus_controller_impl.cc
diff --git a/chrome/browser/chromeos/input_method/ibus_controller_impl.cc b/chrome/browser/chromeos/input_method/ibus_controller_impl.cc
index 70f6dd1f38562c01f9b2337a9da45a5f0067877c..5d98bf58e31ae0b15befe7c7b03771166e94ed55 100644
--- a/chrome/browser/chromeos/input_method/ibus_controller_impl.cc
+++ b/chrome/browser/chromeos/input_method/ibus_controller_impl.cc
@@ -29,6 +29,7 @@
 #include "chromeos/dbus/ibus/ibus_input_context_client.h"
 #include "chromeos/dbus/ibus/ibus_panel_service.h"
 #include "chromeos/dbus/ibus/ibus_property.h"
+#include "chromeos/ime/extension_ime_util.h"
 #include "chromeos/ime/input_method_config.h"
 #include "chromeos/ime/input_method_property.h"
 #include "ui/aura/client/aura_constants.h"
@@ -200,7 +201,7 @@ bool IBusControllerImpl::ChangeInputMethod(const std::string& id) {
   // Sanity checks.
   DCHECK(!InputMethodUtil::IsKeyboardLayout(id));
   if (!whitelist_.InputMethodIdIsWhitelisted(id) &&
-      !InputMethodUtil::IsExtensionInputMethod(id))
+      !extension_ime_util::IsExtensionIME(id))
     return false;
 
   // Clear input method properties unconditionally if |id| is not equal to