Fix a bug where redirect chain gets lost on process swap.

chrome/browser/renderer_host/chrome_url_request_user_data.cc

Index: chrome/browser/renderer_host/chrome_url_request_user_data.cc
diff --git a/chrome/browser/renderer_host/chrome_url_request_user_data.cc b/chrome/browser/renderer_host/chrome_url_request_user_data.cc
index aeabcd1285e7b4235d8acc7c3e6d01890a8bbd17..38545aa4fbc0e80793c899a43c12bfb3f99ed3d6 100644
--- a/chrome/browser/renderer_host/chrome_url_request_user_data.cc
+++ b/chrome/browser/renderer_host/chrome_url_request_user_data.cc
@@ -25,7 +25,10 @@ ChromeURLRequestUserData* ChromeURLRequestUserData::Get(
 ChromeURLRequestUserData* ChromeURLRequestUserData::Create(
     net::URLRequest* request) {
   DCHECK(request);
-  DCHECK(!Get(request));
+  // TODO(mpcomplete): since we're reusing an old URLRequest, this DCHECK
+  // gets hit. We should add a way to clear the UserData for retargeted
+  // requests.
+  //DCHECK(!Get(request));
   ChromeURLRequestUserData* user_data = new ChromeURLRequestUserData();
   request->SetUserData(kKeyName, user_data);
   return user_data;