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 34e78ab1e86101103bbee3e637b643aefa4cef20..ee18e20cabbbf1efd2e48bf365aac00b7f83dea3 100644
--- a/chrome/browser/instant/instant_controller.h
+++ b/chrome/browser/instant/instant_controller.h
@@ -142,6 +142,10 @@ class InstantController {
   // user clicking on it.
   void InstantLoaderContentsFocused();
 
+  // 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);