Session restore: Store and restore persistent IDs for sessionStorage.

content/public/browser/session_storage_namespace.h

Index: content/public/browser/session_storage_namespace.h
diff --git a/content/public/browser/session_storage_namespace.h b/content/public/browser/session_storage_namespace.h
index 2469ad5d4a4a7c833a642776b0fe1bdec200f331..6c1b1a01591fcb8acc5323a95a911e2138dac922 100644
--- a/content/public/browser/session_storage_namespace.h
+++ b/content/public/browser/session_storage_namespace.h
@@ -18,8 +18,6 @@ namespace content {
 class SessionStorageNamespace
     : public base::RefCountedThreadSafe<SessionStorageNamespace> {
  public:
-  SessionStorageNamespace() {}
-
   // Returns the ID of the |SessionStorageNamespace|. The ID is unique among all
   // SessionStorageNamespace objects, but not unique across browser runs.
   virtual int64 id() const = 0;
@@ -28,11 +26,13 @@ class SessionStorageNamespace
   // unique across browser runs.
   virtual const std::string& persistent_id() const = 0;
 
+  // For marking that the sessionStorage will be needed or won't be needed by
+  // session restore.
+  virtual void SetShouldPersist(bool should_persist) = 0;
+
  protected:
   friend class base::RefCountedThreadSafe<SessionStorageNamespace>;
   virtual ~SessionStorageNamespace() {}
-
-  DISALLOW_COPY_AND_ASSIGN(SessionStorageNamespace);
 };
 
 }  // namespace content