Revert of Removing #defines previously used for building without BoringSSL/OpenSSL.

webrtc/BUILD.gn

Index: webrtc/BUILD.gn
diff --git a/webrtc/BUILD.gn b/webrtc/BUILD.gn
index e88e53c6e573ffb81b9003d0449ad183826d6a8a..eb6c3f79b75b6fcda28276d5d0cb5d9e5dde0cb5 100644
--- a/webrtc/BUILD.gn
+++ b/webrtc/BUILD.gn
@@ -30,6 +30,7 @@
     defines = [
       # TODO(kjellander): Cleanup unused ones and move defines closer to
       # the source when webrtc:4256 is completed.
+      "FEATURE_ENABLE_SSL",
       "FEATURE_ENABLE_VOICEMAIL",
       "EXPAT_RELATIVE_PATH",
       "GTEST_RELATIVE_PATH",
@@ -131,10 +132,12 @@
       # targets, there's no point including the defines in that config here.
       # TODO(kjellander): Cleanup unused ones and move defines closer to the
       # source when webrtc:4256 is completed.
+      "HAVE_OPENSSL_SSL_H",
       "HAVE_SRTP",
       "HAVE_WEBRTC_VIDEO",
       "HAVE_WEBRTC_VOICE",
       "LOGGING_INSIDE_WEBRTC",
+      "SSL_USE_OPENSSL",
       "USE_WEBRTC_DEV_BRANCH",
     ]
   } else {