Move Mojo channel initialization closer to IPC::Channel setup

content/content_plugin.gypi

 # Copyright (c) 2011 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.
 
 {
   'conditions': [
     ['enable_plugins==1 and OS!="linux"', {
       'dependencies': [
+        '../mojo/mojo.gyp:mojo_shell_bindings',
         '../skia/skia.gyp:skia',
         '../third_party/WebKit/public/blink.gyp:blink',
         '../third_party/npapi/npapi.gyp:npapi',
       ],
       'include_dirs': [
         '<(INTERMEDIATE_DIR)',
       ],
       'sources': [
         # All .cc, .h, .m, and .mm files under plugins except for tests and
         # mocks.
@@ skipping 18 matching lines @@
       'conditions': [
         ['OS=="win"', {
           'include_dirs': [
             '<(DEPTH)/third_party/wtl/include',
           ],
         }],
       ],
     }],
   ],
 }