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

BUG=none
TEST=none

Review URL: https://codereview.chromium.org/132063006

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@244127 0039d316-1c4b-4281-b951-d872f2087c98

content/public/browser/render_process_host_observer.h

@@ -20,6 +20,8 @@ class CONTENT_EXPORT RenderProcessHostObserver {
   // This method is invoked when a render process exited (either normally or
   // with a crash). To determine if the process closed normally or crashed,
   // examine the |status| parameter.
+  //
+  // Note that this is equivalent to WebContentsObserver::RenderProcessGone().
   virtual void RenderProcessExited(RenderProcessHost* host,
                                    base::ProcessHandle handle,
                                    base::TerminationStatus status,

content/public/browser/web_contents_observer.h

@@ -72,9 +72,11 @@ class CONTENT_EXPORT WebContentsObserver : public IPC::Listener,
 
   // 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