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

chrome/browser/ui/browser.cc

 // Copyright 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.
 
 #include "chrome/browser/ui/browser.h"
 
 #if defined(OS_WIN)
 #include <windows.h>
 #include <shellapi.h>
 #endif  // defined(OS_WIN)
@@ skipping 1114 matching lines @@
   // gestures. So disable overscroll navigation when the bookmark bar is in the
   // detached state and the overscroll effect moves the layers.
   if (value == "1" && bookmark_bar_state_ == BookmarkBar::DETACHED)
     return false;
   return true;
 #else
   return false;
 #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) {
   // Escape exits tabbed fullscreen mode.
   // TODO(koz): Write a test for this http://crbug.com/100441.
   if (event.windowsKeyCode == 27 &&
       fullscreen_controller_->HandleUserPressedEscape()) {
     return true;
   }
   return window()->PreHandleKeyboardEvent(event, is_keyboard_shortcut);
@@ skipping 1267 matching lines @@
   if (contents && !allow_js_access) {
     contents->web_contents()->GetController().LoadURL(
         target_url,
         content::Referrer(),
         content::PAGE_TRANSITION_LINK,
         std::string());  // No extra headers.
   }
 
   return contents != NULL;
 }