Convert PDF component IPC to mojo.

tools/ipc_fuzzer/message_lib/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.
 
 import("//build/config/features.gni")
 
 static_library("ipc_message_lib") {
   configs += [ "//tools/ipc_fuzzer:ipc_fuzzer_tool_config" ]
   public_deps = [
     "//base",
     "//chrome/common",
     "//chrome/common/safe_browsing:proto",
     "//components/network_hints/common",
-    "//components/pdf/common",
     "//components/spellcheck/common",
     "//components/tracing",
     "//content/child",
     "//content/public/child",
     "//ipc",
     "//media/cast:net",
     "//ppapi/proxy:ipc",
     "//skia",
     "//third_party/WebKit/public:blink",
     "//third_party/WebKit/public:blink_headers",
     "//third_party/mt19937ar",
     "//third_party/webrtc_overrides",
     "//ui/accessibility:ax_gen",
   ]
   sources = [
     "all_messages.h",
     "message_cracker.h",
     "message_file.h",
     "message_file_format.h",
     "message_file_reader.cc",
     "message_file_writer.cc",
     "message_names.cc",
     "message_names.h",
   ]
 
   if (enable_nacl) {
     public_deps += [ "//components/nacl/common" ]
   }
 }