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 30821de4f88ff99fc40f90faac6eea4ebe849b00..d94a881d2f47235229933cce6ab6bd1c03d43f10 100644
--- a/chrome/browser/instant/instant_controller.h
+++ b/chrome/browser/instant/instant_controller.h
@@ -145,6 +145,10 @@ class InstantController {
   // Invoked by the InstantLoader when its RenderView crashes.
   void InstantLoaderRenderViewGone();
 
+  // Invoked by the InstantLoader when the instant page wants to commit and
+  // navigate to the speicfied URL.
+  void NavigateToURL(const GURL& url);
+
  private:
   FRIEND_TEST_ALL_PREFIXES(InstantTest, OmniboxFocusLoadsInstant);
   FRIEND_TEST_ALL_PREFIXES(InstantTest, NonInstantSearchProvider);