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

chrome/browser/instant/instant_client.cc

Index: chrome/browser/instant/instant_client.cc
diff --git a/chrome/browser/instant/instant_client.cc b/chrome/browser/instant/instant_client.cc
index 8aa53fb6ca2b30ada42e2926c4dca76b2afb49e2..2e6f6f06e615dfd10ca5c4a6b2e14f0d2a7a2b57 100644
--- a/chrome/browser/instant/instant_client.cc
+++ b/chrome/browser/instant/instant_client.cc
@@ -92,6 +92,8 @@ bool InstantClient::OnMessageReceived(const IPC::Message& message) {
                         StartCapturingKeyStrokes);
     IPC_MESSAGE_HANDLER(ChromeViewHostMsg_StopCapturingKeyStrokes,
                         StopCapturingKeyStrokes);
+    IPC_MESSAGE_HANDLER(ChromeViewHostMsg_SearchBoxNavigate,
+                        SearchBoxNavigate);
     IPC_MESSAGE_UNHANDLED(handled = false)
   IPC_END_MESSAGE_MAP()
   return handled;
@@ -130,3 +132,8 @@ void InstantClient::StopCapturingKeyStrokes(int page_id) {
   if (web_contents()->IsActiveEntry(page_id))
     delegate_->StopCapturingKeyStrokes();
 }
+
+void InstantClient::SearchBoxNavigate(int page_id, const GURL& url) {
+  if (web_contents()->IsActiveEntry(page_id))
+    delegate_->NavigateToURL(url);
+}