Use ChannelMojo in Pepper and NaCl processes.

ppapi/proxy/BUILD.gn

 # Copyright 2015 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.
 
 import("//build/config/nacl/config.gni")
 
 config("proxy_implementation") {
   defines = [ "PPAPI_PROXY_IMPLEMENTATION" ]
 }
 
@@ skipping 326 matching lines @@
   if (is_nacl) {
     sources -= [ "serialized_flash_menu.cc" ]
   }
 
   configs += [ ":proxy_implementation" ]
 
   deps = [
     "//base",
     "//gpu/ipc/common:command_buffer_traits",
     "//ipc",
+    "//ipc/mojo",
+    "//mojo/edk/system",
     "//ppapi/c",
     "//ppapi/shared_impl",
   ]
   if (!is_nacl) {
     deps += [ "//skia" ]
   }
 }
 
 source_set("test_support") {
   testonly = true
@@ skipping 11 matching lines @@
   deps = [
     "//base/test:test_support",
     "//ipc",
     "//ipc:test_support",
     "//ppapi/proxy",
     "//ppapi/shared_impl",
     "//testing/gmock",
     "//testing/gtest",
   ]
 }