Revert of Remove unused HttpClient class.

webrtc/base/BUILD.gn

 # Copyright (c) 2014 The WebRTC project authors. All Rights Reserved.
 #
 # Use of this source code is governed by a BSD-style license
 # that can be found in the LICENSE file in the root of the source
 # tree. An additional intellectual property rights grant can be found
 # in the file PATENTS.  All contributing project authors may
 # be found in the AUTHORS file in the root of the source tree.
 
 import("//build/config/crypto.gni")
 import("//build/config/ui.gni")
@@ skipping 393 matching lines @@
     "filerotatingstream.h",
     "fileutils.cc",
     "fileutils.h",
     "flags.cc",
     "flags.h",
     "gunit_prod.h",
     "helpers.cc",
     "helpers.h",
     "httpbase.cc",
     "httpbase.h",
+    "httpclient.cc",
+    "httpclient.h",
     "httpcommon-inl.h",
     "httpcommon.cc",
     "httpcommon.h",
     "ipaddress.cc",
     "ipaddress.h",
     "linked_ptr.h",
     "messagedigest.cc",
     "messagedigest.h",
     "messagehandler.cc",
     "messagehandler.h",
@@ skipping 359 matching lines @@
       "java/src/org/webrtc/Logging.java",
       "java/src/org/webrtc/Size.java",
       "java/src/org/webrtc/ThreadUtils.java",
     ]
 
     deps = [
       "//base:base_java",
     ]
   }
 }