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 1c1d8042479d491a3b767137a50d0440fe0db149..0e93bd0132043e215614dbaba50e55505879f586 100644
--- a/chrome/browser/instant/instant_controller.h
+++ b/chrome/browser/instant/instant_controller.h
@@ -154,6 +154,10 @@ 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);