Fix accessibility with out-of-process iframes.

content/public/test/browser_test_utils.h

Index: content/public/test/browser_test_utils.h
diff --git a/content/public/test/browser_test_utils.h b/content/public/test/browser_test_utils.h
index bcc424fe289b905f19049d4e425572d041c48322..957292014871b5a4ea09122745bd4391a2d80346 100644
--- a/content/public/test/browser_test_utils.h
+++ b/content/public/test/browser_test_utils.h
@@ -404,6 +404,45 @@ class WebContentsAddedObserver {
   DISALLOW_COPY_AND_ASSIGN(WebContentsAddedObserver);
 };
 
+// This observer keeps track of the last deleted RenderViewHost to avoid
+// accessing it and causing use-after-free condition.
+class RenderViewHostDeletedObserver : public WebContentsObserver {
+ public:
+  RenderViewHostDeletedObserver(RenderViewHost* rvh);
+  ~RenderViewHostDeletedObserver() override;
+  void RenderViewDeleted(RenderViewHost* render_view_host) override;
+  bool deleted();
+  void WaitUntilDeleted();
+
+ private:
+  int process_id_;
+  int routing_id_;
+  bool deleted_;
+  scoped_ptr<base::RunLoop> runner_;
+
+  DISALLOW_COPY_AND_ASSIGN(RenderViewHostDeletedObserver);
+};
+
+// This observer keeps track of the last deleted RenderFrameHost to avoid
+// accessing it and causing use-after-free condition.
+class RenderFrameHostDeletedObserver : public WebContentsObserver {
+ public:
+  RenderFrameHostDeletedObserver(RenderFrameHost* rfh);
+  ~RenderFrameHostDeletedObserver() override;
+  void RenderFrameDeleted(RenderFrameHost* render_frame_host) override;
+  bool deleted();
+  void WaitUntilDeleted();
+
+ private:
+  int process_id_;
+  int routing_id_;
+  bool deleted_;
+  scoped_ptr<base::RunLoop> runner_;
+
+  DISALLOW_COPY_AND_ASSIGN(RenderFrameHostDeletedObserver);
+};
+
+
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_TEST_BROWSER_TEST_UTILS_H_