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

chrome/browser/instant/instant_controller.h

Index: chrome/browser/instant/instant_controller.h
diff --git a/chrome/browser/instant/instant_controller.h b/chrome/browser/instant/instant_controller.h
index 3830fa97f29b50fb744aa05a2e806255b5c06458..8da37e354aea282a58e8eea50597556a188a6cc7 100644
--- a/chrome/browser/instant/instant_controller.h
+++ b/chrome/browser/instant/instant_controller.h
@@ -153,6 +153,10 @@ class InstantController {
   // Invoked by InstantLoader when the instant page is about to navigate.
   void InstantLoaderAboutToNavigateMainFrame(const GURL& url);
 
+  // Invoked by the InstantLoader when the instant page wants to navigate to
+  // the speicfied URL.
+  void NavigateToURL(const GURL& url, content::PageTransition transition);
+
  private:
   FRIEND_TEST_ALL_PREFIXES(InstantTest, OmniboxFocusLoadsInstant);
   FRIEND_TEST_ALL_PREFIXES(InstantTest, NonInstantSearchProvider);