Fix for 'Simple Adblock' extension crashes

content/browser/renderer_host/render_view_host_delegate.h

Index: content/browser/renderer_host/render_view_host_delegate.h
diff --git a/content/browser/renderer_host/render_view_host_delegate.h b/content/browser/renderer_host/render_view_host_delegate.h
index 51fc3dc5057fcc1449ad7bcc6e6a536533e20117..686540b468b8e4978f064933285c3dcfb149cec9 100644
--- a/content/browser/renderer_host/render_view_host_delegate.h
+++ b/content/browser/renderer_host/render_view_host_delegate.h
@@ -12,6 +12,8 @@
 #include "base/process/kill.h"
 #include "base/strings/string16.h"
 #include "content/common/content_export.h"
+#include "content/public/browser/navigation_controller.h"
+#include "content/public/browser/session_storage_namespace.h"
 #include "content/public/common/media_stream_request.h"
 #include "content/public/common/page_transition_types.h"
 #include "net/base/load_states.h"
@@ -277,6 +279,10 @@ class CONTENT_EXPORT RenderViewHostDelegate {
   virtual SessionStorageNamespace* GetSessionStorageNamespace(
       SiteInstance* instance);
 
+  // Returns a copy of the map of session storage namespaces related
+  // to this view.
+  virtual SessionStorageNamespaceMap GetSessionStorageNamespaceMap();
+
   // Returns true if the RenderViewHost will never be visible.
   virtual bool IsNeverVisible();