[Ozone/Scenic] Fix KeyEvent repetition

Currently, all KeyEvents are dispatched with EventType
set to ET_KEY_PRESSED. This cl fixes it.

Change-Id: I6302ed77634ecd64ba18509272ef58c96b37a6f6
Reviewed-on: https://chromium-review.googlesource.com/1142383
Commit-Queue: Mustafa Çamurcu <camurcu@google.com>
Commit-Queue: Sergey Ulanov <sergeyu@chromium.org>
Reviewed-by: Sergey Ulanov <sergeyu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#576185}

ui/ozone/platform/scenic/scenic_window.cc

@@ -340,7 +340,7 @@ bool ScenicWindow::OnKeyboardEvent(
   if (event.code_point)
     dom_key = DomKey::FromCharacter(event.code_point);
 
-  KeyEvent key_event(ET_KEY_PRESSED, key_code, dom_code,
+  KeyEvent key_event(event_type, key_code, dom_code,
                      KeyModifiersToFlags(event.modifiers), dom_key,
                      base::TimeTicks::FromZxTime(event.event_time));
   delegate_->DispatchEvent(&key_event);