Relanding: Removing #defines previously used for building without BoringSSL/OpenSSL.

webrtc/base/BUILD.gn

Index: webrtc/base/BUILD.gn
diff --git a/webrtc/base/BUILD.gn b/webrtc/base/BUILD.gn
index 7c4fcf0ab6463e1123eda7d7403d5e5290715275..b286eb9ba88b8434af5beea6463208998dc61efb 100644
--- a/webrtc/base/BUILD.gn
+++ b/webrtc/base/BUILD.gn
@@ -35,21 +35,10 @@ config("rtc_base_approved_all_dependent_config") {
   }
 }
 
-config("rtc_base_config") {
-  defines = [ "FEATURE_ENABLE_SSL" ]
-}
-
 config("rtc_base_chromium_config") {
   defines = [ "NO_MAIN_THREAD_WRAPPING" ]
 }
 
-config("openssl_config") {
-  defines = [
-    "SSL_USE_OPENSSL",
-    "HAVE_OPENSSL_SSL_H",
-  ]
-}
-
 config("rtc_base_all_dependent_config") {
   if (is_ios) {
     libs = [
@@ -371,16 +360,6 @@ rtc_static_library("rtc_base") {
     ":rtc_base_approved",
   ]
 
-  configs += [
-    ":openssl_config",
-    ":rtc_base_config",
-  ]
-
-  public_configs = [
-    ":openssl_config",
-    ":rtc_base_config",
-  ]
-
   all_dependent_configs = [ ":rtc_base_all_dependent_config" ]
 
   sources = [
@@ -538,7 +517,6 @@ rtc_static_library("rtc_base") {
       "proxyserver.h",
       "rollingaccumulator.h",
       "scopedptrcollection.h",
-      "sslconfig.h",
       "sslroots.h",
       "testbase64.h",
       "testclient.cc",