Make extensions/browser/api/* sources to publicly depend on //ipc

extensions/browser/api/system_display/BUILD.gn

 # Copyright 2016 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.
 
 source_set("system_display") {
   sources = [
     "display_info_provider.cc",
     "display_info_provider.h",
     "system_display_api.cc",
     "system_display_api.h",
   ]
 
-  deps = [
+  public_deps = [
     "//content/public/browser",
     "//extensions/common/api",
   ]
 }