Why this CL triggers an OilPan crash.

content/browser/site_instance_impl.h

Index: content/browser/site_instance_impl.h
diff --git a/content/browser/site_instance_impl.h b/content/browser/site_instance_impl.h
index fc2ad85bd30738cf2167cc2bd8735aeebe7ced99..9c0682d31e558a510f5104107cee80188cdc3bf3 100644
--- a/content/browser/site_instance_impl.h
+++ b/content/browser/site_instance_impl.h
@@ -69,6 +69,9 @@ class CONTENT_EXPORT SiteInstanceImpl final : public SiteInstance,
   // avoid dedicating an unused SiteInstance to it (e.g., in a new tab).
   bool HasRelatedSiteInstance(const GURL& url);
 
+  // Gets an ID of the BrowsingInstance this object is associated with.
+  int GetBrowsingInstanceId() const;
+
   // Returns whether this SiteInstance has a process that is the wrong type for
   // the given URL.  If so, the browser should force a process swap when
   // navigating to the URL.