Revert of [mojo-bindings] Use Watch API instead of MessagePumpMojo

mojo/mojo_public.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.
 
 {
   'includes': [
     'mojo_variables.gypi',
   ],
   'target_defaults' : {
     'include_dirs': [
@@ skipping 56 matching lines @@
         'public/c/system/functions.h',
         'public/c/system/macros.h',
         'public/c/system/message_pipe.h',
         'public/c/system/system_export.h',
         'public/c/system/types.h',
         'public/c/system/wait_set.h',
       ],
     },
     {
       # GN version: //mojo/public/cpp/system
-      'target_name': 'mojo_cpp_system',
-      'type': 'static_library',
+      'target_name': 'mojo_system_cpp_headers',
+      'type': 'none',
       'sources': [
         'public/cpp/system/buffer.h',
         'public/cpp/system/core.h',
         'public/cpp/system/data_pipe.h',
         'public/cpp/system/functions.h',
         'public/cpp/system/handle.h',
         'public/cpp/system/macros.h',
         'public/cpp/system/message_pipe.h',
-        'public/cpp/system/watcher.cc',
-        'public/cpp/system/watcher.h',
       ],
       'dependencies': [
-        '../base/base.gyp:base',
         'mojo_system_headers',
       ],
     },
     {
       # GN version: //mojo/public/cpp/bindings
       'target_name': 'mojo_cpp_bindings',
       'type': 'static_library',
       'include_dirs': [
         '..'
       ],
@@ skipping 81 matching lines @@
         'public/cpp/bindings/no_interface.h',
         'public/cpp/bindings/stl_converters.h',
         'public/cpp/bindings/string.h',
         'public/cpp/bindings/strong_binding.h',
         'public/cpp/bindings/type_converter.h',
         # This comes from the mojo_interface_bindings_cpp_sources dependency.
         '>@(mojom_generated_sources)',
       ],
       'dependencies': [
         '../base/base.gyp:base',
-        'mojo_cpp_system',
+        'mojo_message_pump_lib',
         'mojo_interface_bindings_cpp_sources',
       ],
     },
     {
       # GN version: //mojo/message_pump
       'target_name': 'mojo_message_pump_lib',
       'type': '<(component)',
       'defines': [
         'MOJO_MESSAGE_PUMP_IMPLEMENTATION',
       ],
@@ skipping 345 matching lines @@
              'mojo_interface_bindings_java_sources',
              'mojo_public_java',
              '<(DEPTH)/base/base.gyp:base_java',
            ],
            'includes': [ '../build/java.gypi' ],
         },
       ],
     }],
   ],
 }