Try to restore window.opener when opening blocked popups

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 6c28a408acbacec0a8b886978e3363ca0a5d85b6..b869f14a60b94c6f40f89ef92760b53e00d25dff 100644
--- a/content/public/browser/session_storage_namespace.h
+++ b/content/public/browser/session_storage_namespace.h
@@ -9,14 +9,23 @@
 
 #include "base/basictypes.h"
 #include "base/memory/ref_counted.h"
+#include "content/common/content_export.h"
 
 namespace content {
 
+class DOMStorageContext;
+
 // This is a ref-counted class that represents a SessionStorageNamespace.
 // On destruction it ensures that the storage namespace is destroyed.
 class SessionStorageNamespace
     : public base::RefCountedThreadSafe<SessionStorageNamespace> {
  public:
+  // Constructs a SessionStorageNamespace by cloning |namespace_to_clone|.
+  // |namespace_to_clone| must belong to |context|.
+  CONTENT_EXPORT static SessionStorageNamespace* Clone(
+      DOMStorageContext* context,
+      SessionStorageNamespace* namespace_to_clone);
+
   // 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;