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

chrome/browser/ui/browser.cc

Index: chrome/browser/ui/browser.cc
diff --git a/chrome/browser/ui/browser.cc b/chrome/browser/ui/browser.cc
index b353ff26cc82a33f57aaff33a3aa1d81883e205c..70392550a4936dd7e9f98077cd43e06ddcd800f1 100644
--- a/chrome/browser/ui/browser.cc
+++ b/chrome/browser/ui/browser.cc
@@ -1131,6 +1131,16 @@ bool Browser::CanOverscrollContent() const {
 #endif
 }
 
+bool Browser::ShouldPreserveAbortedURLs(WebContents* source) {
+  // Allow failed URLs to stick around in the omnibox on the NTP, but not when
+  // other pages have committed.
+  Profile* profile = Profile::FromBrowserContext(source->GetBrowserContext());
+  if (!profile || !source->GetController().GetLastCommittedEntry())
+    return false;
+  GURL committed_url(source->GetController().GetLastCommittedEntry()->GetURL());
+  return chrome::IsNTPURL(committed_url, profile);
+}
+
 bool Browser::PreHandleKeyboardEvent(content::WebContents* source,
                                      const NativeWebKeyboardEvent& event,
                                      bool* is_keyboard_shortcut) {