Remove dtlsidentitystore.h from libjingle GYP/GN files.

third_party/libjingle/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")
 
 # From third_party/libjingle/libjingle.gyp's target_defaults.
 config("jingle_unexported_configs") {
   defines = [
     "EXPAT_RELATIVE_PATH",
@@ skipping 232 matching lines @@
       ":libjingle_webrtc_common",
     ]
   }
 
   source_set("libjingle_webrtc_common") {
     sources = [
       "../webrtc/api/audiotrack.cc",
       "../webrtc/api/audiotrack.h",
       "../webrtc/api/datachannel.cc",
       "../webrtc/api/datachannel.h",
-      "../webrtc/api/dtlsidentitystore.h",
       "../webrtc/api/dtmfsender.cc",
       "../webrtc/api/dtmfsender.h",
       "../webrtc/api/jsep.h",
       "../webrtc/api/jsepicecandidate.cc",
       "../webrtc/api/jsepicecandidate.h",
       "../webrtc/api/jsepsessiondescription.cc",
       "../webrtc/api/jsepsessiondescription.h",
       "../webrtc/api/localaudiosource.cc",
       "../webrtc/api/localaudiosource.h",
       "../webrtc/api/mediaconstraintsinterface.cc",
@@ skipping 140 matching lines @@
     sources = [
       "$p2p_dir/stunprober/stunprober.cc",
     ]
 
     deps = [
       ":libjingle_webrtc_common",
       "//third_party/webrtc/base:rtc_base",
     ]
   }
 }  # enable_webrtc