Fix TextInputClientMac related crashes of Fullscreen RenderWidget

content/browser/renderer_host/render_widget_host_delegate.h

Index: content/browser/renderer_host/render_widget_host_delegate.h
diff --git a/content/browser/renderer_host/render_widget_host_delegate.h b/content/browser/renderer_host/render_widget_host_delegate.h
index 2f3a2b37023ed95cd7ad8f894bbefef6d064fd76..724a3af860458348a2bed2a9f4c1a1a4fc5b531b 100644
--- a/content/browser/renderer_host/render_widget_host_delegate.h
+++ b/content/browser/renderer_host/render_widget_host_delegate.h
@@ -222,6 +222,11 @@ class CONTENT_EXPORT RenderWidgetHostDelegate {
   // this RenderWidgetHost.
   virtual bool IsHidden();
 
+  // Returns the current Flash fullscreen RenderWidgetHostImpl if any. This is
+  // not intended for use with other types of fullscreen, such as HTML
+  // fullscreen, and will return nullptr for those cases.
+  virtual RenderWidgetHostImpl* GetFullscreenRenderWidgetHost() const;
+
  protected:
   virtual ~RenderWidgetHostDelegate() {}
 };