Add new IPC for searchbox to pipe SearchBox NavigateContentWindow calls to the browser.

chrome/browser/instant/instant_loader.cc

Index: chrome/browser/instant/instant_loader.cc
diff --git a/chrome/browser/instant/instant_loader.cc b/chrome/browser/instant/instant_loader.cc
index 58bc80e98a6f4cfda58d9f76973dff7fcafe960b..906f7500404a4755c99a0403ab91f18435daa798 100644
--- a/chrome/browser/instant/instant_loader.cc
+++ b/chrome/browser/instant/instant_loader.cc
@@ -318,6 +318,12 @@ void InstantLoader::AboutToNavigateMainFrame(const GURL& url) {
   controller_->InstantLoaderAboutToNavigateMainFrame(url);
 }
 
+void InstantLoader::NavigateToURL(const GURL& url,
+                                  content::PageTransition transition) {
+  InstantSupportDetermined(true);
+  controller_->NavigateToURL(url, transition);
+}
+
 void InstantLoader::Observe(int type,
                             const content::NotificationSource& source,
                             const content::NotificationDetails& details) {