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

chrome/browser/instant/instant_client.h

Index: chrome/browser/instant/instant_client.h
diff --git a/chrome/browser/instant/instant_client.h b/chrome/browser/instant/instant_client.h
index c22a0a66e9addd4a082013d6f40e712911a5aaa2..19a08ae455ed485c1f9964f1b92cebd49a84ddbd 100644
--- a/chrome/browser/instant/instant_client.h
+++ b/chrome/browser/instant/instant_client.h
@@ -61,6 +61,10 @@ class InstantClient : public content::WebContentsObserver {
     // Called when the underlying RenderView crashes.
     virtual void RenderViewGone() = 0;
 
+    // Called when the SearchBox wants to commit the page and navigate to the
+    // specified URL.
+    virtual void NavigateToURL(const GURL& url) = 0;
+
    protected:
     virtual ~Delegate();
   };
@@ -137,6 +141,7 @@ class InstantClient : public content::WebContentsObserver {
                           InstantSizeUnits units);
   void StartCapturingKeyStrokes(int page_id);
   void StopCapturingKeyStrokes(int page_id);
+  void SearchBoxNavigate(int page_id, const GURL& url);
 
   Delegate* const delegate_;