Change WebRTC SslCipher to be exposed as number only.

webrtc/base/opensslstreamadapter.h

Index: webrtc/base/opensslstreamadapter.h
diff --git a/webrtc/base/opensslstreamadapter.h b/webrtc/base/opensslstreamadapter.h
index cf332b155df11e84b69d563430523de0d82d6d2f..e19264ff9d0e8c42b4b9615d6cc4642517023696 100644
--- a/webrtc/base/opensslstreamadapter.h
+++ b/webrtc/base/opensslstreamadapter.h
@@ -92,7 +92,7 @@ class OpenSSLStreamAdapter : public SSLStreamAdapter {
   static const char* GetRfcSslCipherName(const SSL_CIPHER* cipher);
 #endif
 
-  bool GetSslCipher(std::string* cipher) override;
+  bool GetSslCipher(SslCipher* cipher) override;
 
   // Key Extractor interface
   bool ExportKeyingMaterial(const std::string& label,
@@ -110,8 +110,8 @@ class OpenSSLStreamAdapter : public SSLStreamAdapter {
   static bool HaveDtls();
   static bool HaveDtlsSrtp();
   static bool HaveExporter();
-  static std::string GetDefaultSslCipher(SSLProtocolVersion version,
-                                         KeyType key_type);
+  static const SslCipher& GetDefaultSslCipherForTest(SSLProtocolVersion version,
+                                                     KeyType key_type);
 
  protected:
   void OnEvent(StreamInterface* stream, int events, int err) override;