Remove unnecessary use_new_wrapper_types flag for some mojom targets.

ui/events/devices/mojo/BUILD.gn

Index: ui/events/devices/mojo/BUILD.gn
diff --git a/ui/events/devices/mojo/BUILD.gn b/ui/events/devices/mojo/BUILD.gn
index ae95c9dd75606f7fb4b0a4f229bcba0517e20edc..fe65d7d19735568070fee21df3eff6c210f46cfc 100644
--- a/ui/events/devices/mojo/BUILD.gn
+++ b/ui/events/devices/mojo/BUILD.gn
@@ -12,8 +12,6 @@ mojom("mojo") {
   public_deps = [
     "//ui/gfx/geometry/mojo",
   ]
-
-  use_new_wrapper_types = false
 }
 
 mojom("test_interfaces") {
@@ -24,6 +22,4 @@ mojom("test_interfaces") {
   public_deps = [
     ":mojo",
   ]
-
-  use_new_wrapper_types = false
 }