Revert "Add SSLConfig object to IceServer."

This reverts commit 7f1ffcccce563a086da037334aec2d4faa723edb.

Reason for revert: Speculative revert

Original change's description:
> Add SSLConfig object to IceServer.
> 
> This is being added to allow greater configurability to TLS connections.
> tlsAlpnProtocols, tlsEllipticCurves and tlsCertPolicy will be removed from IceServer in a
> follow-up CL.
> 
> Bug: webrtc:9662
> Change-Id: I33cb804b02c26c662ed2a28c76f9a9dc2df40f36
> Reviewed-on: https://webrtc-review.googlesource.com/96020
> Commit-Queue: Diogo Real <diogor@google.com>
> Reviewed-by: Qingsi Wang <qingsi@webrtc.org>
> Reviewed-by: Benjamin Wright <benwright@webrtc.org>
> Reviewed-by: Steve Anton <steveanton@webrtc.org>
> Reviewed-by: Sami Kalliomäki <sakal@webrtc.org>
> Reviewed-by: Kári Helgason <kthelgason@webrtc.org>
> Cr-Commit-Position: refs/heads/master@{#24559}

TBR=steveanton@webrtc.org,sakal@webrtc.org,kthelgason@webrtc.org,juberti@webrtc.org,emadomara@webrtc.org,qingsi@webrtc.org,benwright@webrtc.org,diogor@google.com

Change-Id: Iae9fc68b77f743876bda36fc2a04f6d791aae8e2
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: webrtc:9662
Reviewed-on: https://webrtc-review.googlesource.com/98000
Reviewed-by: Ying Wang <yinwa@webrtc.org>
Commit-Queue: Ying Wang <yinwa@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#24563}

sdk/objc/api/peerconnection/RTCIceServer.h

@@ -11,7 +11,11 @@
 #import <Foundation/Foundation.h>
 
 #import "RTCMacros.h"
-#import "RTCSSLConfig.h"
+
+typedef NS_ENUM(NSUInteger, RTCTlsCertPolicy) {
+  RTCTlsCertPolicySecure,
+  RTCTlsCertPolicyInsecureNoCheck
+};
 
 NS_ASSUME_NONNULL_BEGIN
 
@@ -28,8 +32,7 @@ RTC_EXPORT
 @property(nonatomic, readonly, nullable) NSString *credential;
 
 /**
-  Deprecated. TODO(diogor, webrtc:9673): Remove from API.
-  TLS certificate policy to use if this RTCIceServer object is a TURN server.
+ * TLS certificate policy to use if this RTCIceServer object is a TURN server.
  */
 @property(nonatomic, readonly) RTCTlsCertPolicy tlsCertPolicy;
 
@@ -40,24 +43,15 @@ RTC_EXPORT
  */
 @property(nonatomic, readonly, nullable) NSString *hostname;
 
-/**
-  Deprecated. TODO(diogor, webrtc:9673): Remove from API.
-  List of protocols to be used in the TLS ALPN extension.
-  This field will be ignored if also set in RTCSSLConfig.
- */
+/** List of protocols to be used in the TLS ALPN extension. */
 @property(nonatomic, readonly) NSArray<NSString *> *tlsAlpnProtocols;
 
 /**
-  Deprecated. TODO(diogor, webrtc:9673): Remove from API.
   List elliptic curves to be used in the TLS elliptic curves extension.
   Only curve names supported by OpenSSL should be used (eg. "P-256","X25519").
-  This field will be ignored if also set in RTCSSLConfig.
   */
 @property(nonatomic, readonly) NSArray<NSString *> *tlsEllipticCurves;
 
-/** SSL configuration options for any SSL/TLS connections to this IceServer. */
-@property(nonatomic, readonly) RTCSSLConfig *sslConfig;
-
 - (nonnull instancetype)init NS_UNAVAILABLE;
 
 /** Convenience initializer for a server with no authentication (e.g. STUN). */
@@ -112,17 +106,8 @@ RTC_EXPORT
                      tlsCertPolicy:(RTCTlsCertPolicy)tlsCertPolicy
                           hostname:(nullable NSString *)hostname
                   tlsAlpnProtocols:(nullable NSArray<NSString *> *)tlsAlpnProtocols
-                 tlsEllipticCurves:(nullable NSArray<NSString *> *)tlsEllipticCurves;
-
-/**
- * Initialize an RTCIceServer with its associated URLs, optional
- * username, optional credential, hostname and SSL config.
- */
-- (instancetype)initWithURLStrings:(NSArray<NSString *> *)urlStrings
-                          username:(nullable NSString *)username
-                        credential:(nullable NSString *)credential
-                          hostname:(nullable NSString *)hostname
-                         sslConfig:(RTCSSLConfig *)sslConfig NS_DESIGNATED_INITIALIZER;
+                 tlsEllipticCurves:(nullable NSArray<NSString *> *)tlsEllipticCurves
+    NS_DESIGNATED_INITIALIZER;
 
 @end