Remove //mojo/platform_handle

content/common/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/common/common.gni")
 import("//media/media_options.gni")
 import("//mojo/public/tools/bindings/mojom.gni")
 if (is_mac) {
@@ skipping 47 matching lines @@
     "//ipc",
     "//ipc/mojo",
     "//media",
     "//media:shared_memory_support",
     "//media/base/ipc",
     "//media/gpu/ipc/client",
     "//media/gpu/ipc/common",
     "//media/midi",
     "//mojo/common:common_base",
     "//mojo/edk/system",
-    "//mojo/platform_handle:platform_handle_impl",
     "//net",
     "//sandbox",
     "//services/shell",
     "//services/shell/public/cpp",
     "//services/shell/public/interfaces",
     "//services/shell/runner/common",
     "//skia",
     "//storage/common",
     "//third_party/WebKit/public:blink_minimal",
     "//third_party/boringssl",
@@ skipping 160 matching lines @@
     "//components/leveldb/public/interfaces",
     "//components/mus/public/interfaces",
     "//services/shell/public/interfaces",
     "//skia/public/interfaces",
     "//third_party/WebKit/public:mojo_bindings",
     "//ui/mojo/geometry:interfaces",
     "//url/mojo:url_mojom_gurl",
     "//url/mojo:url_mojom_origin",
   ]
 }