Readd and fix comment from previous change.

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Review URL: https://codereview.chromium.org/17597004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@208268 0039d316-1c4b-4281-b951-d872f2087c98
diff --git a/content/browser/web_contents/web_contents_impl.cc b/content/browser/web_contents/web_contents_impl.cc
index 400ed4f9..9c02c6f 100644
--- a/content/browser/web_contents/web_contents_impl.cc
+++ b/content/browser/web_contents/web_contents_impl.cc
@@ -3481,6 +3481,7 @@
                     BeforeUnloadFired(proceed_time));
   if (delegate_)
     delegate_->BeforeUnloadFired(this, proceed, proceed_to_fire_unload);
+  // Note: |this| might be deleted at this point.
 }
 
 void WebContentsImpl::RenderViewGoneFromRenderManager(