Change most uses of Pickle to base::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..9938d290a31ce4808fe8e1036618ce99bd6b7343 100644
--- a/net/http/http_vary_data.cc
+++ b/net/http/http_vary_data.cc
@@ -64,7 +64,7 @@ bool HttpVaryData::Init(const HttpRequestInfo& request_info,
   return is_valid_ = true;
 }
 
-bool HttpVaryData::InitFromPickle(PickleIterator* iter) {
+bool HttpVaryData::InitFromPickle(base::PickleIterator* iter) {
   is_valid_ = false;
   const char* data;
   if (iter->ReadBytes(&data, sizeof(request_digest_))) {
@@ -74,7 +74,7 @@ bool HttpVaryData::InitFromPickle(PickleIterator* iter) {
   return false;
 }
 
-void HttpVaryData::Persist(Pickle* pickle) const {
+void HttpVaryData::Persist(base::Pickle* pickle) const {
   DCHECK(is_valid());
   pickle->WriteBytes(&request_digest_, sizeof(request_digest_));
 }