Revert of This CL replaces e-mail with AccountId on user selection screen.

components/signin/core/account_id/account_id.cc

Index: components/signin/core/account_id/account_id.cc
diff --git a/components/signin/core/account_id/account_id.cc b/components/signin/core/account_id/account_id.cc
index e933f4b571b0839b9b40fc2ad8b58b36db4cf93f..65b237fa2758b5c19d604db08dc0259f9b0338c2 100644
--- a/components/signin/core/account_id/account_id.cc
+++ b/components/signin/core/account_id/account_id.cc
@@ -6,20 +6,13 @@
 
 #include <functional>
 
-#include "base/json/json_reader.h"
-#include "base/json/json_writer.h"
 #include "base/memory/singleton.h"
-#include "base/values.h"
 #include "google_apis/gaia/gaia_auth_util.h"
 
 namespace {
 
 // Known account types.
 const char kGoogle[] = "google";
-
-// Serialization keys
-const char kGaiaIdKey[] = "gaia_id";
-const char kEmailKey[] = "email";
 
 struct GoogleStringSingleton {
   GoogleStringSingleton() : google(kGoogle) {}
@@ -122,47 +115,6 @@
   return AccountId(gaia_id, email);
 }
 
-std::string AccountId::Serialize() const {
-  base::DictionaryValue value;
-  value.SetString(kGaiaIdKey, gaia_id_);
-  value.SetString(kEmailKey, user_email_);
-
-  std::string serialized;
-  base::JSONWriter::Write(value, &serialized);
-  return serialized;
-}
-
-// static
-bool AccountId::Deserialize(const std::string& serialized,
-                            AccountId* account_id) {
-  base::JSONReader reader;
-  scoped_ptr<const base::Value> value(reader.Read(serialized));
-  const base::DictionaryValue* dictionary_value = NULL;
-
-  if (!value || !value->GetAsDictionary(&dictionary_value))
-    return false;
-
-  std::string gaia_id;
-  std::string user_email;
-
-  const bool found_gaia_id = dictionary_value->GetString(kGaiaIdKey, &gaia_id);
-  const bool found_user_email =
-      dictionary_value->GetString(kEmailKey, &user_email);
-
-  if (!found_gaia_id)
-    LOG(ERROR) << "gaia_id is not found in '" << serialized << "'";
-
-  if (!found_user_email)
-    LOG(ERROR) << "user_email is not found in '" << serialized << "'";
-
-  if (!found_gaia_id && !found_user_email)
-    return false;
-
-  *account_id = FromUserEmailGaiaId(user_email, gaia_id);
-
-  return true;
-}
-
 const AccountId& EmptyAccountId() {
   return AccountId::EmptyAccountId::GetInstance()->user_id;
 }