Discourage creation of Java infobars without InfoBarDelegates

components/infobars.gypi

 # 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.
 
 {
   'targets': [
     {
       # GN version: //components/infobars/core
       'target_name': 'infobars_core',
       'type': 'static_library',
@@ skipping 30 matching lines @@
       'conditions': [
         ['OS != "ios" and OS != "android"', {
           'dependencies': [
             '../ui/gfx/gfx.gyp:gfx_vector_icons',
             '../ui/native_theme/native_theme.gyp:native_theme',
           ],
         }],
       ],
     },
   ],
+  'conditions': [
+    ['OS == "android"', {
+      'targets': [
+        {
+          'target_name': 'infobar_delegate_java',
+          'type': 'none',
+          'variables': {
+            'source_file': 'infobars/core/infobar_delegate.h',
+          },
+          'includes': [ '../build/android/java_cpp_enum.gypi' ],
+        },
+      ],
+    }],
+  ],
 }