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 ce16cf4a3d2358b12f72492a4fedba992183b393..be33f31b4de1b762d233b44d86a0e8aec9a43c96 100644
--- a/chrome/browser/chromeos/input_method/ibus_controller_impl.cc
+++ b/chrome/browser/chromeos/input_method/ibus_controller_impl.cc
@@ -31,6 +31,7 @@
 #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 "ui/aura/client/aura_constants.h"
 #include "ui/aura/root_window.h"
 #include "ui/base/ime/input_method_ibus.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