[Linux views]Fix the return value of WidgetGtk::HandleKeyboardEvent().

views/widget/widget_gtk.cc

Index: views/widget/widget_gtk.cc
diff --git a/views/widget/widget_gtk.cc b/views/widget/widget_gtk.cc
index 93fdcdc174aeb54fc7d4c3b9ac99ace5e5ff7a80..42aac381b5856caffa8a4cdde41458958751d1de 100644
--- a/views/widget/widget_gtk.cc
+++ b/views/widget/widget_gtk.cc
@@ -879,8 +879,9 @@ bool WidgetGtk::HandleKeyboardEvent(GdkEventKey* event) {
 
   if (event->type == GDK_KEY_PRESS) {
     // VKEY_MENU is triggered by key release event.
+    // FocusManager::OnKeyEvent() returns false when the key has been consumed.
     if (key_code != base::VKEY_MENU)
-      handled = focus_manager_->OnKeyEvent(key);
+      handled = !focus_manager_->OnKeyEvent(key);
     else
       should_handle_menu_key_release_ = true;
   } else if (key_code == base::VKEY_MENU && should_handle_menu_key_release_ &&