Fix compilation of WebRTC on iOS for Chromium.

webrtc/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.
 
 # TODO(kjellander): Rebase this to webrtc/build/common.gypi changes after r6330.
 
 import("//build/config/linux/pkg_config.gni")
 import("build/webrtc.gni")
 import("//third_party/protobuf/proto_library.gni")
 
 # Contains the defines and includes in common.gypi that are duplicated both as
 # target_defaults and direct_dependent_settings.
 config("common_inherited_config") {
   defines = []
   if (build_with_mozilla) {
     defines += [ "WEBRTC_MOZILLA_BUILD" ]
   }
   if (build_with_chromium) {
-    defines = [ "WEBRTC_CHROMIUM_BUILD" ]
+    defines += [ "WEBRTC_CHROMIUM_BUILD" ]
     include_dirs = [
       # The overrides must be included first as that is the mechanism for
       # selecting the override headers in Chromium.
       "../webrtc_overrides",
 
       # Allow includes to be prefixed with webrtc/ in case it is not an
       # immediate subdirectory of the top-level.
       "..",
     ]
+
+    if (is_ios) {
+      defines += [ "SSL_USE_OPENSSL" ]

[kjellander_webrtc, 2015/11/16 14:47:13]

I don't want our GYP and GN builds to diverge. I understand that the way all the
crypto stuff differs a bit but shouldn't there be a better way of solving this? 
I tried to summarize what I know in
https://bugs.chromium.org/p/webrtc/issues/detail?id=5213

+    }
   }
   if (is_posix) {
     defines += [ "WEBRTC_POSIX" ]
   }
   if (is_ios) {
     defines += [
       "WEBRTC_MAC",
       "WEBRTC_IOS",
     ]
   }
@@ skipping 228 matching lines @@
   if (rtc_enable_protobuf) {
     defines += [ "ENABLE_RTC_EVENT_LOG" ]
     deps += [ ":rtc_event_log_proto" ]
   }
   if (is_clang && !is_nacl) {
     # Suppress warnings from Chrome's Clang plugins.
     # See http://code.google.com/p/webrtc/issues/detail?id=163 for details.
     configs -= [ "//build/config/clang:find_bad_constructs" ]
   }
 }