[VK] Disable gesture editing feature in new UI.

Gesture editing is not supported in the new UI. So we should disable
the flag so that it doesn't appear in the keyboard settings page.

Bug: 890134
Change-Id: I7dc3c6d05bad6e19e8cbfe0a6f89de603f4ddce5
Reviewed-on: https://chromium-review.googlesource.com/1250683Reviewed-by: Yuichiro Hanada <yhanada@chromium.org>
Commit-Queue: Darren Shen <shend@chromium.org>
Cr-Commit-Position: refs/heads/master@{#595384}

ui/keyboard/keyboard_util.cc

@@ -222,8 +222,11 @@ bool IsGestureTypingEnabled() {
 }
 
 bool IsGestureEditingEnabled() {
-  return !base::CommandLine::ForCurrentProcess()->HasSwitch(
-      switches::kDisableGestureEditing);
+  // TODO(https://crbug.com/890134): Gesture editing is not implemented in the
+  // new UI.
+  return !IsVirtualKeyboardMdUiEnabled() &&
+         !base::CommandLine::ForCurrentProcess()->HasSwitch(
+             switches::kDisableGestureEditing);
 }
 
 bool IsImeServiceEnabled() {