Implement local NTP for fallback.

chrome/browser/search/search.cc

Index: chrome/browser/search/search.cc
diff --git a/chrome/browser/search/search.cc b/chrome/browser/search/search.cc
index 438533603a8297e46ab6242fb98ccc8504246169..0fb9bade9f83b215944a6194fa32cef98fda4adf 100644
--- a/chrome/browser/search/search.cc
+++ b/chrome/browser/search/search.cc
@@ -310,7 +310,8 @@ bool NavEntryIsInstantNTP(const content::WebContents* contents,
   Profile* profile = Profile::FromBrowserContext(contents->GetBrowserContext());
   return IsInstantExtendedAPIEnabled() &&
          IsRenderedInInstantProcess(contents, profile) &&
-         IsInstantURL(entry->GetVirtualURL(), profile) &&
+         (IsInstantURL(entry->GetVirtualURL(), profile) ||
+          entry->GetVirtualURL() == GURL(chrome::kChromeSearchLocalNtpUrl)) &&
          GetSearchTermsImpl(contents, entry).empty();
 }
 
@@ -318,9 +319,7 @@ bool ShouldAssignURLToInstantRenderer(const GURL& url, Profile* profile) {
   return url.is_valid() &&
          profile &&
          (url.SchemeIs(chrome::kChromeSearchScheme) ||
-          IsInstantURL(url, profile) ||
-          (IsInstantExtendedAPIEnabled() &&
-           url == GURL(chrome::kChromeSearchLocalOmniboxPopupURL)));
+          IsInstantURL(url, profile));
 }
 
 void RegisterUserPrefs(PrefRegistrySyncable* registry) {