Translate: New Bubble UX (for the view toolkit)

chrome/browser/ui/translate/language_combobox_model.cc

Index: chrome/browser/ui/translate/language_combobox_model.cc
diff --git a/chrome/browser/ui/translate/language_combobox_model.cc b/chrome/browser/ui/translate/language_combobox_model.cc
index 031998addd1c6b8f3c6f5ef1378ea80f4a0a92c0..4874fec0e0f205e979c26526c72cf300331f885b 100644
--- a/chrome/browser/ui/translate/language_combobox_model.cc
+++ b/chrome/browser/ui/translate/language_combobox_model.cc
@@ -9,8 +9,10 @@
 LanguageComboboxModel::LanguageComboboxModel(
     int default_index,
     TranslateBubbleModel* model)
-    : default_index_(default_index),
+    : default_index_(default_index < 0 ? 0 : default_index),
       model_(model) {
+  // view::Combobox can't treate an negative index, but |default_index| can be
+  // negative when, for example, the page's language can't be detected.
 }
 
 LanguageComboboxModel::~LanguageComboboxModel() {