Add support for GCM cipher suites from RFC 7714.

webrtc/api/peerconnectionfactory.h

Index: webrtc/api/peerconnectionfactory.h
diff --git a/webrtc/api/peerconnectionfactory.h b/webrtc/api/peerconnectionfactory.h
index 995c760cb4a372c5687c2ae5965c891b1f99d3da..bb49b4b74a5589332b6e56ba9acf94c56cf1977c 100644
--- a/webrtc/api/peerconnectionfactory.h
+++ b/webrtc/api/peerconnectionfactory.h
@@ -35,9 +35,7 @@ typedef rtc::RefCountedObject<DtlsIdentityStoreImpl>
 
 class PeerConnectionFactory : public PeerConnectionFactoryInterface {
  public:
-  virtual void SetOptions(const Options& options) {
-    options_ = options;
-  }
+  void SetOptions(const Options& options) override;
 
   // Deprecated, use version without constraints.
   rtc::scoped_refptr<PeerConnectionInterface> CreatePeerConnection(