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 9d08d426a77275a038ad24cd06e36d4e5031ae31..aa82fea2d6c165c44b01fe0857e5a6bc28a3cdda 100644
--- a/chrome/browser/instant/instant_loader.cc
+++ b/chrome/browser/instant/instant_loader.cc
@@ -297,6 +297,11 @@ void InstantLoader::RenderViewGone() {
   controller_->InstantLoaderRenderViewGone();
 }
 
+void InstantLoader::NavigateToURL(const GURL& url) {
+  InstantSupportDetermined(true);
+  controller_->NavigateToURL(url);
+}
+
 void InstantLoader::Observe(int type,
                             const content::NotificationSource& source,
                             const content::NotificationDetails& details) {