no native implementation of Textfield.

views/controls/textfield/textfield.cc

Index: views/controls/textfield/textfield.cc
diff --git a/views/controls/textfield/textfield.cc b/views/controls/textfield/textfield.cc
index 81c74d26aebbf74aab3576d4b28de99002769a68..e92794daae21721d34adbe55ca34f6ed6a7850e4 100644
--- a/views/controls/textfield/textfield.cc
+++ b/views/controls/textfield/textfield.cc
@@ -358,8 +358,7 @@ app::KeyboardCode Textfield::Keystroke::GetKeyboardCode() const {
 #if defined(OS_WIN)
   return static_cast<app::KeyboardCode>(key_);
 #else
-  return static_cast<app::KeyboardCode>(
-      app::WindowsKeyCodeForGdkKeyCode(event_.keyval));
+  return event_->GetKeyCode();
 #endif
 }
 
@@ -373,13 +372,11 @@ bool Textfield::Keystroke::IsShiftHeld() const {
 }
 #else
 bool Textfield::Keystroke::IsControlHeld() const {
-  return (event_.state & gtk_accelerator_get_default_mod_mask()) ==
-      GDK_CONTROL_MASK;
+  return event_->IsControlDown();
 }
 
 bool Textfield::Keystroke::IsShiftHeld() const {
-  return (event_.state & gtk_accelerator_get_default_mod_mask()) ==
-      GDK_SHIFT_MASK;
+  return event_->IsShiftDown();
 }
 #endif