Fix ipc_fuzzer linking in CrOS ASAN builds.

tools/ipc_fuzzer/fuzzer/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/sanitizers/sanitizers.gni")
 
 executable("ipc_fuzzer") {
   configs += [ "//tools/ipc_fuzzer:ipc_fuzzer_tool_config" ]
   sources = [
     "fuzzer.cc",
     "fuzzer.h",
     "fuzzer_main.cc",
     "generator.cc",
     "generator.h",
     "mutator.cc",
     "mutator.h",
     "rand_util.cc",
     "rand_util.h",
   ]
   deps = [
     "//tools/ipc_fuzzer/message_lib:ipc_message_lib",
   ]
   if (is_asan && is_chromeos) {
     # Compiling fuzzer.cc with ASan takes too long, see
     # http://crbug.com/360158.
     configs -= [ "//build/config/sanitizers:default_sanitizer_flags" ]
+    configs += [ "//build/config/sanitizers:default_sanitizer_ldflags" ]
   }
 }