Fix compilation of WebRTC on iOS for Chromium.

webrtc/BUILD.gn

Index: webrtc/BUILD.gn
diff --git a/webrtc/BUILD.gn b/webrtc/BUILD.gn
index 45e7c144fd920661aaa029a207d5592658b6b52a..40e2828c9c475d40ab860727e76fa5e0fc7f65ec 100644
--- a/webrtc/BUILD.gn
+++ b/webrtc/BUILD.gn
@@ -20,7 +20,7 @@ config("common_inherited_config") {
     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.
@@ -30,6 +30,10 @@ config("common_inherited_config") {
       # 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" ]