GuestView: Cleanup on Embedder process swap

extensions/browser/guest_view/guest_view_base.cc

Index: extensions/browser/guest_view/guest_view_base.cc
diff --git a/extensions/browser/guest_view/guest_view_base.cc b/extensions/browser/guest_view/guest_view_base.cc
index cdf9f0a04a1520cac457f6ede2c2675c1185b77f..44b6899c951742592125df0fa2906cd385f5ed9b 100644
--- a/extensions/browser/guest_view/guest_view_base.cc
+++ b/extensions/browser/guest_view/guest_view_base.cc
@@ -70,6 +70,12 @@ class GuestViewBase::EmbedderWebContentsObserver : public WebContentsObserver {
     Destroy();
   }
 
+  virtual void RenderViewHostChanged(
+      content::RenderViewHost* old_host,
+      content::RenderViewHost* new_host) OVERRIDE {
+    Destroy();
+  }
+
   virtual void RenderProcessGone(base::TerminationStatus status) OVERRIDE {
     Destroy();
   }