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

webrtc/base/sslstreamadapter.h

Index: webrtc/base/sslstreamadapter.h
diff --git a/webrtc/base/sslstreamadapter.h b/webrtc/base/sslstreamadapter.h
index 391019165ff9558efaf8e41ff85f4dc877f73d92..4f5ee02fe44343fb7028e5f9ca354a371ff50d9d 100644
--- a/webrtc/base/sslstreamadapter.h
+++ b/webrtc/base/sslstreamadapter.h
@@ -228,10 +228,9 @@ class SSLStreamAdapter : public StreamAdapterInterface {
   // SS_OPENING but IsTlsConnected should return true.
   virtual bool IsTlsConnected() = 0;
 
-  // Capabilities testing
-  static bool HaveDtls();
-  static bool HaveDtlsSrtp();
-  static bool HaveExporter();
+  // Capabilities testing.
+  // Used to have "DTLS supported", "DTLS-SRTP supported" etc. methods, but now
+  // that's assumed.
   static bool IsBoringSsl();
 
   // Returns true iff the supplied cipher is deemed to be strong.