Remove deprecated-declarations warnings.

ios/third_party/gcdwebserver/BUILD.gn

 # Copyright 2015 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.
 
 config("config") {
   visibility = [ ":gcdwebserver" ]
   libs = [
     "CFNetwork.framework",
     "MobileCoreServices.framework",
     "z",
   ]
 
   include_dirs = [
     "src/GCDWebServer/Core",
     "src/GCDWebServer/Requests",
     "src/GCDWebServer/Responses",
   ]
 }
 
-config("private_config") {
-  visibility = [ ":gcdwebserver" ]
-
-  # TODO(crbug.com/569158): Suppresses warnings that are treated as errors

[sdefresne, 2017/05/23 13:13:06]

Please add BUG=569158 to CL description.

-  # when minimum iOS version support is increased to iOS 9 and up.
-  # This should be removed once all deprecation violations have been fixed.
-  cflags = [ "-Wno-error=deprecated-declarations" ]
-}
-
 source_set("gcdwebserver") {
   testonly = true
 
   sources = [
     "src/GCDWebServer/Core/GCDWebServer.h",
     "src/GCDWebServer/Core/GCDWebServer.m",
     "src/GCDWebServer/Core/GCDWebServerConnection.h",
     "src/GCDWebServer/Core/GCDWebServerConnection.m",
     "src/GCDWebServer/Core/GCDWebServerFunctions.h",
     "src/GCDWebServer/Core/GCDWebServerFunctions.m",
@@ skipping 15 matching lines @@
     "src/GCDWebServer/Responses/GCDWebServerDataResponse.m",
     "src/GCDWebServer/Responses/GCDWebServerErrorResponse.h",
     "src/GCDWebServer/Responses/GCDWebServerErrorResponse.m",
     "src/GCDWebServer/Responses/GCDWebServerFileResponse.h",
     "src/GCDWebServer/Responses/GCDWebServerFileResponse.m",
     "src/GCDWebServer/Responses/GCDWebServerStreamedResponse.h",
     "src/GCDWebServer/Responses/GCDWebServerStreamedResponse.m",
   ]
 
   public_configs = [ ":config" ]
-  configs += [
-    ":private_config",
-    "//build/config/compiler:enable_arc",
-  ]
+  configs += [ "//build/config/compiler:enable_arc" ]
 }