Reload Local NTP on default search provider change.

chrome/browser/search/search.h

Index: chrome/browser/search/search.h
diff --git a/chrome/browser/search/search.h b/chrome/browser/search/search.h
index dfc202e9fa3a38ebe1a346a0a16765469c3f7435..e1fec526def25d4684db222901e1f026c48d44f2 100644
--- a/chrome/browser/search/search.h
+++ b/chrome/browser/search/search.h
@@ -97,11 +97,14 @@ bool NavEntryIsInstantNTP(const content::WebContents* contents,
 // lead to an infinite recursion.
 GURL GetInstantURL(Profile* profile, int start_margin);
 
-// Returns the Local Instant URL of the default search engine.  In particular,
-// a Google search provider will include a special query parameter, indicating
-// to the JS that Google-specific New Tab Page elements should be rendered.
+// Returns the Local Instant URL of the New Tab Page.
+// TODO(kmadhusu): Remove this function and update the call sites.
 GURL GetLocalInstantURL(Profile* profile);
 
+// Returns true if the default search provider is Google. Used to indicate the
+// JS that Google-specific New Tab Page elements should be rendered.
+bool DefaultSearchProviderIsGoogle(Profile* profile);
+
 // Returns true if 'use_remote_ntp_on_startup' flag is enabled in field trials
 // to always show the remote NTP on browser startup.
 bool ShouldPreferRemoteNTPOnStartup();