Reland "[cleanup] Remove useless includes."

Reason for reland: Downstream project fixed.

Original change's description:

> [cleanup] Remove useless includes.
>
> Manual cleanup guided by include-what-you-use diagnostic.
>
> Bug: webrtc:8311
> Change-Id: I00be03392cc7ee005101427ea7dc701621ccea68
> Reviewed-on: https://webrtc-review.googlesource.com/c/103320
> Commit-Queue: Yves Gerey <yvesg@webrtc.org>
> Reviewed-by: Patrik Höglund <phoglund@webrtc.org>
> Cr-Commit-Position: refs/heads/master@{#25013}

Bug: webrtc:8311
Change-Id: Id6ec4aeb798886a90ace640a190eaf16497ba31b
Reviewed-on: https://webrtc-review.googlesource.com/c/104120
Commit-Queue: Yves Gerey <yvesg@webrtc.org>
Reviewed-by: Patrik Höglund <phoglund@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#25034}
diff --git a/rtc_base/openssladapter.h b/rtc_base/openssladapter.h
index 50a7c08..45ffc6f 100644
--- a/rtc_base/openssladapter.h
+++ b/rtc_base/openssladapter.h
@@ -13,19 +13,22 @@
 
 #include <openssl/ossl_typ.h>
 
-#include <map>
 #include <memory>
 #include <string>
 #include <vector>
 
-#include "absl/memory/memory.h"
-#include "rtc_base/buffer.h"
-#include "rtc_base/messagehandler.h"
-#include "rtc_base/messagequeue.h"
-#include "rtc_base/opensslcertificate.h"
-#include "rtc_base/opensslidentity.h"
-#include "rtc_base/opensslsessioncache.h"
-#include "rtc_base/ssladapter.h"
+#include "rtc_base/asyncsocket.h"          // for AsyncSocket
+#include "rtc_base/buffer.h"               // for Buffer
+#include "rtc_base/messagehandler.h"       // for MessageHandler
+#include "rtc_base/messagequeue.h"         // for Message
+#include "rtc_base/opensslidentity.h"      // for SSL_CTX, OpenSSLIdentity
+#include "rtc_base/opensslsessioncache.h"  // for OpenSSLSessionCache
+#include "rtc_base/socket.h"               // for Socket::ConnState
+#include "rtc_base/socketaddress.h"        // for SocketAddress
+#include "rtc_base/ssladapter.h"           // for SSLAdapter, SSLAdapterFactory
+#include "rtc_base/sslcertificate.h"       // for SSLCertificateVerifier
+#include "rtc_base/sslidentity.h"          // for SSLIdentity
+#include "rtc_base/sslstreamadapter.h"     // for SSLMode, SSLRole, SSL_MODE...
 
 namespace rtc {