Point out in the comments the equivalence of two observer functions.

content/public/browser/web_contents_observer.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CONTENT_PUBLIC_BROWSER_WEB_CONTENTS_OBSERVER_H_
 #define CONTENT_PUBLIC_BROWSER_WEB_CONTENTS_OBSERVER_H_
 
 #include "base/process/kill.h"
 #include "base/process/process_handle.h"
 #include "content/common/content_export.h"
@@ skipping 54 matching lines @@
   virtual void RenderViewReady() {}
 
   // This method is invoked when a RenderViewHost of the WebContents is
   // deleted. Note that this does not always happen when the WebContents starts
   // to use a different RenderViewHost, as the old RenderViewHost might get
   // just swapped out.
   virtual void RenderViewDeleted(RenderViewHost* render_view_host) {}
 
   // This method is invoked when the process for the current RenderView crashes.
   // The WebContents continues to use the RenderViewHost, e.g. when the user
-  // reloads the current page.
-  // When the RenderViewHost is deleted, the RenderViewDeleted method will be
-  // invoked.
+  // reloads the current page. When the RenderViewHost itself is deleted, the
+  // RenderViewDeleted method will be invoked.
+  //
+  // Note that this is equivalent to
+  // RenderProcessHostObserver::RenderProcessExited().
   virtual void RenderProcessGone(base::TerminationStatus status) {}
 
   // This method is invoked when a WebContents swaps its render view host with
   // another one, possibly changing processes. The RenderViewHost that has
   // been replaced is in |old_render_view_host|, which is NULL if the old RVH
   // was shut down.
   virtual void RenderViewHostChanged(RenderViewHost* old_host,
                                      RenderViewHost* new_host) {}
 
   // This method is invoked after the WebContents decided which RenderViewHost
@@ skipping 265 matching lines @@
   void WebContentsImplDestroyed();
 
   WebContentsImpl* web_contents_;
 
   DISALLOW_COPY_AND_ASSIGN(WebContentsObserver);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_BROWSER_WEB_CONTENTS_OBSERVER_H_