Don't kill key events even when it's VKEY_UNKNOWN.

ui/aura/window_targeter.cc

Index: ui/aura/window_targeter.cc
diff --git a/ui/aura/window_targeter.cc b/ui/aura/window_targeter.cc
index 7a32de529392c29937c4aeba08c9955a437d643a..601321525e817571fc00c5f63792fa69e5727dd5 100644
--- a/ui/aura/window_targeter.cc
+++ b/ui/aura/window_targeter.cc
@@ -86,7 +86,8 @@ Window* WindowTargeter::FindTargetForKeyEvent(Window* window,
                                               const ui::KeyEvent& key) {
   Window* root_window = window->GetRootWindow();
   if (key.key_code() == ui::VKEY_UNKNOWN &&
-      (key.flags() & ui::EF_IME_FABRICATED_KEY) == 0)
+      (key.flags() & ui::EF_IME_FABRICATED_KEY) == 0 &&
+      key.GetCharacter() == 0)
     return NULL;
   client::FocusClient* focus_client = client::GetFocusClient(root_window);
   Window* focused_window = focus_client->GetFocusedWindow();