Revert of Remove deprecated methods from Pickle.

net/http/http_vary_data.cc

Index: net/http/http_vary_data.cc
diff --git a/net/http/http_vary_data.cc b/net/http/http_vary_data.cc
index f2f853cb066e288edd8918c7f4b0065f828b6d12..f102058cdefaf280e8456342f81c2e741af908eb 100644
--- a/net/http/http_vary_data.cc
+++ b/net/http/http_vary_data.cc
@@ -64,10 +64,10 @@
   return is_valid_ = true;
 }
 
-bool HttpVaryData::InitFromPickle(PickleIterator* iter) {
+bool HttpVaryData::InitFromPickle(const Pickle& pickle, PickleIterator* iter) {
   is_valid_ = false;
   const char* data;
-  if (iter->ReadBytes(&data, sizeof(request_digest_))) {
+  if (pickle.ReadBytes(iter, &data, sizeof(request_digest_))) {
     memcpy(&request_digest_, data, sizeof(request_digest_));
     return is_valid_ = true;
   }