GN: Remove "outputs" parameter for java_cpp_enum()

ui/android/BUILD.gn

 # Copyright 2015 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/android/rules.gni")
 import("//testing/test.gni")
 
 assert(is_android)
 
 component("android") {
@@ skipping 52 matching lines @@
 java_cpp_enum("java_enums_srcjar") {
   sources = [
     "../base/ime/text_input_type.h",
     "../base/page_transition_types.h",
     "../base/touch/touch_device.h",
     "../base/window_open_disposition.h",
     "../gfx/android/java_bitmap.h",
     "resources/resource_manager.h",
     "resources/system_ui_resource_type.h",
   ]
-  outputs = [
-    "org/chromium/ui/WindowOpenDisposition.java",
-    "org/chromium/ui/base/PageTransition.java",
-    "org/chromium/ui/base/HoverType.java",
-    "org/chromium/ui/base/PointerType.java",
-    "org/chromium/ui/base/ime/TextInputType.java",
-    "org/chromium/ui/gfx/BitmapFormat.java",
-    "org/chromium/ui/resources/AndroidResourceType.java",
-    "org/chromium/ui/resources/SystemUIResourceType.java",
-  ]
 }
 
 java_strings_grd("ui_strings_grd") {
   grd_file = "java/strings/android_ui_strings.grd"
   outputs = [
     "values-am/android_ui_strings.xml",
     "values-ar/android_ui_strings.xml",
     "values-bg/android_ui_strings.xml",
     "values-ca/android_ui_strings.xml",
     "values-cs/android_ui_strings.xml",
@@ skipping 81 matching lines @@
     "//cc:test_support",
     "//skia",
     "//testing/gmock",
     "//testing/gtest",
     "//ui/base",
     "//ui/gfx",
     "//ui/resources:ui_test_pak",
   ]
   apk_deps = [ ":ui_java" ]
 }