Add missing RTC_EXPORT for the component build.

Bug: webrtc:9419
Change-Id: I3225259fb4cc55e9820f590928795f4587f1e3cb
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/153884
Reviewed-by: Karl Wiberg <kwiberg@webrtc.org>
Commit-Queue: Mirko Bonadei <mbonadei@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#29479}

rtc_base/ssl_certificate.h

diff --git a/rtc_base/ssl_certificate.h b/rtc_base/ssl_certificate.h
index fad1404..3b3f24f 100644
--- a/rtc_base/ssl_certificate.h
+++ b/rtc_base/ssl_certificate.h
@@ -23,10 +23,11 @@
 
 #include "rtc_base/buffer.h"
 #include "rtc_base/constructor_magic.h"
+#include "rtc_base/system/rtc_export.h"
 
 namespace rtc {
 
-struct SSLCertificateStats {
+struct RTC_EXPORT SSLCertificateStats {
   SSLCertificateStats(std::string&& fingerprint,
                       std::string&& fingerprint_algorithm,
                       std::string&& base64_certificate,
@@ -46,7 +47,7 @@
 // The SSLCertificate object is pretty much immutable once created.
 // (The OpenSSL implementation only does reference counting and
 // possibly caching of intermediate results.)
-class SSLCertificate {
+class RTC_EXPORT SSLCertificate {
  public:
   // Parses and builds a certificate from a PEM encoded string.
   // Returns null on failure.
@@ -90,7 +91,7 @@
 // SSLCertChain is a simple wrapper for a vector of SSLCertificates. It serves
 // primarily to ensure proper memory management (especially deletion) of the
 // SSLCertificate pointers.
-class SSLCertChain final {
+class RTC_EXPORT SSLCertChain final {
  public:
   explicit SSLCertChain(std::unique_ptr<SSLCertificate> single_cert);
   explicit SSLCertChain(std::vector<std::unique_ptr<SSLCertificate>> certs);