Discard SSL certificates for non-committed entries to save memory.

content/browser/frame_host/navigation_controller_impl.h

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CONTENT_BROWSER_FRAME_HOST_NAVIGATION_CONTROLLER_IMPL_H_
 #define CONTENT_BROWSER_FRAME_HOST_NAVIGATION_CONTROLLER_IMPL_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 331 matching lines @@
   // Inserts up to |max_index| entries from |source| into this. This does NOT
   // adjust any of the members that reference entries_
   // (last_committed_entry_index_, pending_entry_index_ or
   // transient_entry_index_).
   void InsertEntriesFrom(const NavigationControllerImpl& source, int max_index);
 
   // Returns the navigation index that differs from the current entry by the
   // specified |offset|.  The index returned is not guaranteed to be valid.
   int GetIndexForOffset(int offset) const;
 
+  // Removes SSL certificate for all entries other than the last committed one.
+  void DiscardUnusedSSLCerts();
+
   // ---------------------------------------------------------------------------
 
   // The user browser context associated with this controller.
   BrowserContext* browser_context_;
 
   // List of |NavigationEntry|s for this controller.
   std::vector<std::unique_ptr<NavigationEntryImpl>> entries_;
 
   // An entry we haven't gotten a response for yet.  This will be discarded
   // when we navigate again.  It's used only so we know what the currently
@@ skipping 90 matching lines @@
   // these are ReloadType::NONE and a null timestamp, respectively.
   ReloadType last_committed_reload_type_;
   base::Time last_committed_reload_time_;
 
   DISALLOW_COPY_AND_ASSIGN(NavigationControllerImpl);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_FRAME_HOST_NAVIGATION_CONTROLLER_IMPL_H_