Revise ui::DomKey to unify character and non-character codes.

chrome/browser/chromeos/input_method/input_method_engine.cc

Index: chrome/browser/chromeos/input_method/input_method_engine.cc
diff --git a/chrome/browser/chromeos/input_method/input_method_engine.cc b/chrome/browser/chromeos/input_method/input_method_engine.cc
index 15a14396aaa9bf92e76819c1652ba0350eb9aa5e..732cc8573ab6f563000ad9699400fce51d349c03 100644
--- a/chrome/browser/chromeos/input_method/input_method_engine.cc
+++ b/chrome/browser/chromeos/input_method/input_method_engine.cc
@@ -308,18 +308,10 @@ bool InputMethodEngine::SendKeyEvents(
     flags |= event.shift_key ? ui::EF_SHIFT_DOWN     : ui::EF_NONE;
     flags |= event.caps_lock ? ui::EF_CAPS_LOCK_DOWN : ui::EF_NONE;
 
-    base::char16 ch = 0;
-    // 4-bytes UTF-8 string is at least 2-characters UTF-16 string.
-    // And Key char can only be single UTF-16 character.
-    if (!event.key.empty() && event.key.size() < 4) {
-      base::string16 key_char = base::UTF8ToUTF16(event.key);
-      if (key_char.size() == 1)
-        ch = key_char[0];
-    }
     ui::KeyEvent ui_event(
         type, key_code,
         ui::KeycodeConverter::CodeStringToDomCode(event.code.c_str()), flags,
-        ui::KeycodeConverter::KeyStringToDomKey(event.key.c_str()), ch,
+        ui::KeycodeConverter::KeyStringToDomKey(event.key.c_str()),
         ui::EventTimeForNow());
     base::AutoReset<const ui::KeyEvent*> reset_sent_key(&sent_key_event_,
                                                         &ui_event);