Stop linking in the old Mojo EDK.

mojo/platform_handle/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.
 
 # See comments in mojo/public/c/system/BUILD.gn which this is based on.
 # Summary: depend on this target to use the platform handle functions without
 # linking against a specific implementation.
 # For component targets, add //mojo/platform_handle:for_component to your deps
 # section.
 # For shared_library targets (e.g., a Mojo App), add
 # //mojo/platform_handle:for_shared_library to your deps.
 source_set("platform_handle") {
   sources = [
     "platform_handle.h",
     "platform_handle_functions.h",
   ]
   deps = [
+    "//mojo/edk/embedder:platform",
     "//mojo/public/c/system",
   ]
 }
 
 component("platform_handle_impl") {
   output_name = "platform_handle_impl"
   public_deps = [
     ":platform_handle",
   ]
   sources = [
     "platform_handle_functions.cc",
   ]
   defines = [ "PLATFORM_HANDLE_IMPLEMENTATION" ]
   deps = [
     "//base",
+    "//mojo/edk/embedder:headers",
+    "//mojo/edk/embedder:platform",
     "//mojo/public/c/system:for_component",
-    "//third_party/mojo/src/mojo/edk/embedder:headers",
   ]
 }
 
 source_set("platform_handle_thunks") {
   public_deps = [
     ":platform_handle",
   ]
   sources = [
     "platform_handle_private_thunks.cc",
     "platform_handle_private_thunks.h",
@@ skipping 22 matching lines @@
 group("for_component") {
   public_deps = [
     ":platform_handle",
   ]
   if (is_component_build) {
     deps = [
       ":platform_handle_impl",
     ]
   }
 }