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

webrtc/base/sslidentity.cc

Index: webrtc/base/sslidentity.cc
diff --git a/webrtc/base/sslidentity.cc b/webrtc/base/sslidentity.cc
index 645050a7e4b9deccc0b045d4539c6a2cc5f35b93..a5dd7b9ce686b63256fe417836c936e6e2116e59 100644
--- a/webrtc/base/sslidentity.cc
+++ b/webrtc/base/sslidentity.cc
@@ -17,14 +17,8 @@
 #include "webrtc/base/base64.h"
 #include "webrtc/base/checks.h"
 #include "webrtc/base/logging.h"
-#include "webrtc/base/sslconfig.h"
-#include "webrtc/base/sslfingerprint.h"
-
-#if SSL_USE_OPENSSL
-
 #include "webrtc/base/opensslidentity.h"
-
-#endif  // SSL_USE_OPENSSL
+#include "webrtc/base/sslfingerprint.h"
 
 namespace rtc {
 
@@ -213,8 +207,6 @@ SSLCertChain::~SSLCertChain() {
   std::for_each(certs_.begin(), certs_.end(), DeleteCert);
 }
 
-#if SSL_USE_OPENSSL
-
 // static
 SSLCertificate* SSLCertificate::FromPEMString(const std::string& pem_string) {
   return OpenSSLCertificate::FromPEMString(pem_string);
@@ -260,12 +252,6 @@ bool operator!=(const SSLIdentity& a, const SSLIdentity& b) {
   return !(a == b);
 }
 
-#else  // !SSL_USE_OPENSSL
-
-#error "No SSL implementation"
-
-#endif  // SSL_USE_OPENSSL
-
 // Read |n| bytes from ASN1 number string at *|pp| and return the numeric value.
 // Update *|pp| and *|np| to reflect number of read bytes.
 static inline int ASN1ReadInt(const unsigned char** pp, size_t* np, size_t n) {