Add WebContentObserver::OnWebContentsLostFocus()

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 a2d2d9bcfe55b03617deab88d9a8c5a6ea9a36dd..a4177e92f2727a07ec85686f3b9117e056e31b3c 100644
--- a/content/browser/renderer_host/render_widget_host_delegate.h
+++ b/content/browser/renderer_host/render_widget_host_delegate.h
@@ -60,6 +60,10 @@ class CONTENT_EXPORT RenderWidgetHostDelegate {
   // The RenderWidgetHost got the focus.
   virtual void RenderWidgetGotFocus(RenderWidgetHostImpl* render_widget_host) {}
 
+  // The RenderWidgetHost lost the focus.
+  virtual void RenderWidgetLostFocus(
+      RenderWidgetHostImpl* render_widget_host) {}
+
   // The RenderWidget was resized.
   virtual void RenderWidgetWasResized(RenderWidgetHostImpl* render_widget_host,
                                       bool width_changed) {}