Revert of Change base::Value::ListStorage to std::vector<base::Value>

chrome/browser/net/predictor_unittest.cc

Index: chrome/browser/net/predictor_unittest.cc
diff --git a/chrome/browser/net/predictor_unittest.cc b/chrome/browser/net/predictor_unittest.cc
index 04690c7424e74122caac29dc6ba22cf2650b195f..9b947c0b02e020f9eb980862a5513558d3b7e554 100644
--- a/chrome/browser/net/predictor_unittest.cc
+++ b/chrome/browser/net/predictor_unittest.cc
@@ -106,8 +106,6 @@
 
     // ...and make it part of the serialized referral_list.
     referral_list->Append(base::WrapUnique(motivation_list));
-    // |motivation_list| is invalidated at this point, so it needs to be reset.
-    referral_list->GetList(referral_list->GetSize() - 1, &motivation_list);
   }
 
   base::ListValue* subresource_list(NULL);