Don't leave aborted URLs in the omnibox unless we're on a new tab.

content/public/browser/web_contents_delegate.h

Index: content/public/browser/web_contents_delegate.h
diff --git a/content/public/browser/web_contents_delegate.h b/content/public/browser/web_contents_delegate.h
index b869a52af7f64752cdecf2221e02ada453e3e4f8..92be5dbf2fe6df17222676bfb041c52c0fc0ac3f 100644
--- a/content/public/browser/web_contents_delegate.h
+++ b/content/public/browser/web_contents_delegate.h
@@ -173,6 +173,10 @@ class CONTENT_EXPORT WebContentsDelegate {
   // Default is false.
   virtual bool ShouldSuppressDialogs();
 
+  // Returns whether URLs for aborted browser-initiated navigations should be
+  // preserved in the omnibox.  Defaults to false.

[jam, 2014/04/21 07:31:08]

nit: avoid mentioning omnibox in content since that's a chrome feature. explain
it instead in terms of content-level objects, i.e. pending entry

[Charlie Reis, 2014/04/21 17:29:00]

Done.

+  virtual bool ShouldPreserveAbortedURLs(WebContents* source);
+
   // Add a message to the console. Returning true indicates that the delegate
   // handled the message. If false is returned the default logging mechanism
   // will be used for the message.