Remove mojo/tools/, not needed in chromium

mojo/mojo_base.gyp

 # 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.
 
 # Essential components (and their tests) that are needed to build
 # Chrome should be here.  Other components that are useful only in
 # Mojo land like mojo_shell should be in mojo.gyp.
 {
   'includes': [
     'mojo_variables.gypi',
   ],
   'targets': [
     {
       'target_name': 'mojo_base',
       'type': 'none',
       'dependencies': [
         # NOTE: If adding a new dependency here, please consider whether it
         # should also be added to the list of Mojo-related dependencies of
         # build/all.gyp:All on iOS, as All cannot depend on the mojo_base
         # target on iOS due to the presence of the js targets, which cause v8
         # to be built.
         'mojo_common_lib',
         'mojo_common_unittests',
-        'mojo_message_generator',
       ],
       'conditions': [
         ['OS == "android"', {
           'dependencies': [
             'public/mojo_public.gyp:mojo_bindings_java',
             'public/mojo_public.gyp:mojo_public_java',
           ],
         }],
       ]
     },
@@ skipping 144 matching lines @@
         'bindings/js/drain_data.h',
         'bindings/js/handle.cc',
         'bindings/js/handle.h',
         'bindings/js/handle_close_observer.h',
         'bindings/js/support.cc',
         'bindings/js/support.h',
         'bindings/js/waiting_callback.cc',
         'bindings/js/waiting_callback.h',
       ],
     },
-    {
-      # GN version: //mojo/tools:message_generator
-      'target_name': 'mojo_message_generator',
-      'type': 'executable',
-      'dependencies': [
-        '../base/base.gyp:base',
-        '../testing/gtest.gyp:gtest',
-        'edk/mojo_edk.gyp:mojo_system_impl',
-        'mojo_common_lib',
-        'mojo_environment_chromium',
-        'public/mojo_public.gyp:mojo_cpp_bindings',
-      ],
-      'sources': [
-        'tools/message_generator.cc',
-      ],
-    },
   ],
   'conditions': [
     ['OS=="android"', {
       'targets': [
         {
           'target_name': 'mojo_jni_headers',
           'type': 'none',
           'dependencies': [
             'mojo_java_set_jni_headers',
           ],
@@ skipping 42 matching lines @@
           ],
           'variables': {
             'java_in_dir': '<(DEPTH)/mojo/android/system',
           },
           'includes': [ '../build/java.gypi' ],
         },
       ]
     }]
   ]
 }