Change most uses of Pickle to base::Pickle

net/cert/x509_certificate_unittest.cc

Index: net/cert/x509_certificate_unittest.cc
diff --git a/net/cert/x509_certificate_unittest.cc b/net/cert/x509_certificate_unittest.cc
index 4fdb9a7aa3788e466a84af3fe48dc86f25af05e2..3bf667195c218428a8ce583b6f1d0bd3ad20fed0 100644
--- a/net/cert/x509_certificate_unittest.cc
+++ b/net/cert/x509_certificate_unittest.cc
@@ -613,10 +613,10 @@ TEST(X509CertificateTest, Pickle) {
   X509Certificate::FreeOSCertHandle(google_cert_handle);
   X509Certificate::FreeOSCertHandle(thawte_cert_handle);
 
-  Pickle pickle;
+  base::Pickle pickle;
   cert->Persist(&pickle);
 
-  PickleIterator iter(pickle);
+  base::PickleIterator iter(pickle);
   scoped_refptr<X509Certificate> cert_from_pickle =
       X509Certificate::CreateFromPickle(
           &iter, X509Certificate::PICKLETYPE_CERTIFICATE_CHAIN_V3);