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

chrome/renderer/searchbox/searchbox_extension.cc

Index: chrome/renderer/searchbox/searchbox_extension.cc
diff --git a/chrome/renderer/searchbox/searchbox_extension.cc b/chrome/renderer/searchbox/searchbox_extension.cc
index 15bb23b0eb4e701c9e8be39fbf1610d651e34ea2..1a6c88d978318aed5af308465ba14de10a1efba3 100644
--- a/chrome/renderer/searchbox/searchbox_extension.cc
+++ b/chrome/renderer/searchbox/searchbox_extension.cc
@@ -583,10 +583,8 @@ v8::Handle<v8::Value> SearchBoxExtensionWrapper::NavigateContentWindow(
   }
 
   // Navigate the main frame.
-  if (destination_url.is_valid()) {
-    WebKit::WebURLRequest request(destination_url);
-    render_view->GetWebView()->mainFrame()->loadRequest(request);
-  }
+  if (destination_url.is_valid())
+    SearchBox::Get(render_view)->NavigateToURL(destination_url);
 
   return v8::Undefined();
 }