Add an SignedCertificateTimetampStore, making SignedCertificateTimestamp be refcounted to aid.

content/content_browser.gypi

Index: content/content_browser.gypi
diff --git a/content/content_browser.gypi b/content/content_browser.gypi
index dd4de31ebeda43f7f458d9311443b09c602923d8..18955dd08cc9d978978d63aea4301f778ea6f6dd 100644
--- a/content/content_browser.gypi
+++ b/content/content_browser.gypi
@@ -163,6 +163,7 @@
     'public/browser/resource_request_info.h',
     'public/browser/resource_throttle.h',
     'public/browser/save_page_type.h',
+    'public/browser/sct_store.h',
     'public/browser/session_storage_namespace.h',
     'public/browser/session_storage_usage_info.h',
     'public/browser/site_instance.h',
@@ -732,6 +733,8 @@
     'browser/message_port_service.h',
     'browser/mime_registry_message_filter.cc',
     'browser/mime_registry_message_filter.h',
+    'browser/sct_store_impl.cc',
+    'browser/sct_store_impl.h',
     'browser/service_worker/service_worker_context.h',
     'browser/service_worker/service_worker_context_core.cc',
     'browser/service_worker/service_worker_context_core.h',
@@ -1289,6 +1292,7 @@
         ['include', '^browser/cert_store_impl\\.cc$'],
         ['include', '^browser/download/download_create_info\\.cc$'],
         ['include', '^browser/notification_service_impl\\.cc$'],
+        ['include', '^browser/sct_store_impl\\.cc$'],
         ['include', '^browser/user_metrics\\.cc$'],
         ['include', '^browser/web_contents/navigation_entry_impl\\.cc$'],
       ],