Fix DevToolsBeforeUnloadTest and BrowserCloseManagerBrowserTest.

content/public/browser/render_widget_host.h

Index: content/public/browser/render_widget_host.h
diff --git a/content/public/browser/render_widget_host.h b/content/public/browser/render_widget_host.h
index 068e826699696b8f7f939073ab8338526e4a3f38..2ae1a08e1b52b0d6116fd7d3c4a1d815c5c17ddd 100644
--- a/content/public/browser/render_widget_host.h
+++ b/content/public/browser/render_widget_host.h
@@ -189,11 +189,6 @@ class CONTENT_EXPORT RenderWidgetHost : public IPC::Sender {
   // warning too soon.
   virtual void RestartHangMonitorTimeoutIfNecessary() = 0;
 
-  // Stops and disables hang monitor. This avoids flakiness in tests that need
-  // to observe things like beforeunload dialogs, which could fail if the
-  // timeout skips the dialog.
-  virtual void DisableHangMonitorForTesting() = 0;
-
   virtual void SetIgnoreInputEvents(bool ignore_input_events) = 0;
 
   // Called to notify the RenderWidget that it has been resized.