Stop linking in the old Mojo EDK.

content/child/BUILD.gn

 # 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.
 
 import("//build/config/features.gni")
 import("//build/config/ui.gni")
 import("//content/child/child.gni")
 
 source_set("child") {
   # Only the public target should depend on this. All other targets (even
   # internal content ones) should depend on the public one.
   visibility = [ "//content/public/child:child_sources" ]
 
   sources = rebase_path(content_child_gypi_values.private_child_sources,
                         ".",
                         "//content")
 
   configs += [
     "//build/config:precompiled_headers",
     "//content/public/common:mojo_shell_client",
   ]
 
   public_deps = [
-    "//third_party/mojo/src/mojo/edk/system",
+    "//mojo/edk/system",
   ]
 
   deps = [
     "//base",
     "//components/mime_util",
     "//components/tracing",
     "//components/tracing:startup_tracing",
     "//components/webcrypto",
     "//content/common:mojo_bindings",
     "//mojo/common",
@@ skipping 85 matching lines @@
       "//third_party/WebKit/public:resources",
       "//third_party/npapi",
     ]
   }
 
   if (use_aura && is_mac) {
     # This file is already excluded on non-Mac.
     sources -= [ "npapi/webplugin_delegate_impl_mac.mm" ]
   }
 }