Remove the 2-level input method system & InputMethodBridge.

ui/views/controls/menu/menu_controller.cc

Index: ui/views/controls/menu/menu_controller.cc
diff --git a/ui/views/controls/menu/menu_controller.cc b/ui/views/controls/menu/menu_controller.cc
index 062c5f18aafe5565f2fb16b62970062fe7c81aab..54d3410bdd8508a9c8e34d20036bacfa330a401f 100644
--- a/ui/views/controls/menu/menu_controller.cc
+++ b/ui/views/controls/menu/menu_controller.cc
@@ -2078,7 +2078,7 @@ bool MenuController::SelectByChar(base::char16 character) {
     return AcceptOrSelect(item, details);
 
   if (is_combobox_) {
-    item->GetSubmenu()->GetTextInputClient()->InsertChar(character, 0);
+    item->GetSubmenu()->GetPrefixSelector()->InsertChar(character, 0);
   } else {
     // If no mnemonics found, look at first character of titles.
     details = FindChildForMnemonic(item, key, &TitleMatchesMnemonic);