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

webrtc/base/opensslidentity.cc

Index: webrtc/base/opensslidentity.cc
diff --git a/webrtc/base/opensslidentity.cc b/webrtc/base/opensslidentity.cc
index 2f1c565938cec00247b471a78fa84d437f1f7035..7b96f6a20616b228db03bb07cb06b94934a5ffe2 100644
--- a/webrtc/base/opensslidentity.cc
+++ b/webrtc/base/opensslidentity.cc
@@ -8,8 +8,6 @@
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
-#if HAVE_OPENSSL_SSL_H
-
 #include "webrtc/base/opensslidentity.h"
 
 #include <memory>
@@ -576,5 +574,3 @@ bool OpenSSLIdentity::operator!=(const OpenSSLIdentity& other) const {
 }
 
 }  // namespace rtc
-
-#endif  // HAVE_OPENSSL_SSL_H