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 0f37e86129412047e4ac7864ac4b51c5dcae1a1d..7cb578540e72dcb04f19e8d1b003e0d7876b2bc8 100644
--- a/chrome/browser/instant/instant_controller.h
+++ b/chrome/browser/instant/instant_controller.h
@@ -148,6 +148,10 @@ 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);
+
  private:
   FRIEND_TEST_ALL_PREFIXES(InstantTest, OmniboxFocusLoadsInstant);
   FRIEND_TEST_ALL_PREFIXES(InstantTest, NonInstantSearchProvider);