sync: Move unique_client_tag hashing code

sync/internal_api/base_node.cc

Index: sync/internal_api/base_node.cc
diff --git a/sync/internal_api/base_node.cc b/sync/internal_api/base_node.cc
index 19de5728203d4c662538abd59654867d01710f2e..f640532bdd95a1563d322bde69eaef626af8a6b1 100644
--- a/sync/internal_api/base_node.cc
+++ b/sync/internal_api/base_node.cc
@@ -6,8 +6,6 @@
 
 #include <stack>
 
-#include "base/base64.h"
-#include "base/sha1.h"
 #include "base/string_number_conversions.h"
 #include "base/utf_string_conversions.h"
 #include "base/values.h"
@@ -65,21 +63,6 @@ BaseNode::BaseNode() : password_data_(new sync_pb::PasswordSpecificsData) {}
 
 BaseNode::~BaseNode() {}
 
-std::string BaseNode::GenerateSyncableHash(
-    ModelType model_type, const std::string& client_tag) {
-  // Blank PB with just the field in it has termination symbol,
-  // handy for delimiter.
-  sync_pb::EntitySpecifics serialized_type;
-  AddDefaultFieldValue(model_type, &serialized_type);
-  std::string hash_input;
-  serialized_type.AppendToString(&hash_input);
-  hash_input.append(client_tag);
-
-  std::string encode_output;
-  CHECK(base::Base64Encode(base::SHA1HashString(hash_input), &encode_output));
-  return encode_output;
-}
-
 bool BaseNode::DecryptIfNecessary() {
   if (!GetEntry()->Get(syncable::UNIQUE_SERVER_TAG).empty())
       return true;  // Ignore unique folders.