GN: Remove "outputs" parameter for java_cpp_enum()

ui/touch_selection/BUILD.gn

 # Copyright 2014 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 import("//build/config/ui.gni")
 import("//testing/test.gni")
 
 if (is_android) {
   import("//build/config/android/rules.gni")
 }
@@ skipping 87 matching lines @@
   data_deps = [
     "//third_party/mesa:osmesa",
   ]
 }
 
 if (is_android) {
   java_cpp_enum("ui_touch_selection_enums_srcjar") {
     sources = [
       "selection_event_type.h",
     ]
-    outputs = [
-      "org/chromium/ui/touch_selection/SelectionEventType.java",
-    ]
   }
   java_cpp_enum("ui_touch_handle_orientation_srcjar") {
     sources = [
       "touch_handle_orientation.h",
     ]
-    outputs = [
-      "org/chromium/ui/touch_selection/TouchHandleOrientation.java",
-    ]
   }
 }