Remove some unnecessary webkit/common/gpu and third_party/wtl deps

mojo/mojo.gyp

 # Copyright 2013 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.
 
 {
   'target_defaults': {
     'conditions': [
       ['mojo_shell_debug_url != ""', {
         'defines': [
           'MOJO_SHELL_DEBUG=1',
@@ skipping 442 matching lines @@
         {
           # GN version: //mojo/aura
           'target_name': 'mojo_aura_support',
           'type': 'static_library',
           'dependencies': [
             '../cc/cc.gyp:cc',
             '../ui/aura/aura.gyp:aura',
             '../ui/compositor/compositor.gyp:compositor',
             '../ui/events/events.gyp:events',
             '../ui/events/events.gyp:events_base',
-            '../webkit/common/gpu/webkit_gpu.gyp:webkit_gpu',
             'mojo_cc_support',
             'mojo_native_viewport_bindings',
           ],
           'includes': [
             'mojo_public_gles2_for_loadable_module.gypi',
           ],
           'sources': [
             'aura/aura_init.cc',
             'aura/aura_init.h',
             'aura/context_factory_mojo.cc',
@@ skipping 181 matching lines @@
             'mojo_python_unittests.isolate',
           ],
           'sources': [
             'mojo_python_unittests.isolate',
           ],
         },
       ],
     }],
   ],
 }