Cleanup: remove GTK stuff

ui/views/ime/input_method.h

Index: ui/views/ime/input_method.h
diff --git a/ui/views/ime/input_method.h b/ui/views/ime/input_method.h
index 310b6e1bc931da601cb84eb11b4e98c246fa4f52..d26cd98666251cccb90071cf18805d9a56f44a0b 100644
--- a/ui/views/ime/input_method.h
+++ b/ui/views/ime/input_method.h
@@ -30,10 +30,10 @@ class Widget;
 // An interface implemented by an object that encapsulates a native input method
 // service provided by the underlying operation system.
 // Because on most systems, the system input method service is bound to
-// individual native window. On Windows, its HWND, on Linux/Gtk, its GdkWindow.
-// And in Views control system, only the top-level NativeWidget has a native
-// window that can get keyboard focus. So this API is designed to be bound to
-// the top-level NativeWidget.
+// individual native window. On Windows, its HWND, on Aura, its
+// ui::aura::Window. And in Views control system, only the top-level
+// NativeWidget has a native window that can get keyboard focus. So this API is
+// designed to be bound to the top-level NativeWidget.
 class VIEWS_EXPORT InputMethod {
  public:
   virtual ~InputMethod() {}