focus reverse traversal was not working for TextfieldViews.

views/controls/textfield/native_textfield_gtk.cc

Index: views/controls/textfield/native_textfield_gtk.cc
diff --git a/views/controls/textfield/native_textfield_gtk.cc b/views/controls/textfield/native_textfield_gtk.cc
index 2878b3c166eed944c89158e7ec0bbf4abeda216c..e3ffc2d5db7c241c9dfe56d36a0cbf125174ac77 100644
--- a/views/controls/textfield/native_textfield_gtk.cc
+++ b/views/controls/textfield/native_textfield_gtk.cc
@@ -257,10 +257,6 @@ void NativeTextfieldGtk::UpdateEnabled() {
   SetEnabled(textfield_->IsEnabled());
 }
 
-bool NativeTextfieldGtk::IsPassword() {
-  return textfield_->IsPassword();
-}
-
 gfx::Insets NativeTextfieldGtk::CalculateInsets() {
   if (!native_view())
     return gfx::Insets();
@@ -329,8 +325,9 @@ void NativeTextfieldGtk::UpdateVerticalMargins() {
   }
 }
 
-void NativeTextfieldGtk::SetFocus() {
+bool NativeTextfieldGtk::SetFocus() {
   Focus();
+  return true;
 }
 
 View* NativeTextfieldGtk::GetView() {
@@ -446,4 +443,8 @@ void NativeTextfieldGtk::NativeControlCreated(GtkWidget* widget) {
   g_signal_connect(widget, "activate", G_CALLBACK(OnActivateHandler), this);
 }
 
+bool NativeTextfieldGtk::IsPassword() {
+  return textfield_->IsPassword();
+}
+
 }  // namespace views