Use base64 SHA1 hash for sync IDs

chrome/browser/sync/engine/syncapi.cc

 // Copyright (c) 2006-2009 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/sync/engine/syncapi.h"
 
 #include "build/build_config.h"
 
 #if defined(OS_WIN)
 #include <windows.h>
@@ skipping 11 matching lines @@
 #include <linux/netlink.h>
 #include <linux/rtnetlink.h>
 #endif
 
 #include <iomanip>
 #include <list>
 #include <string>
 #include <vector>
 
 #include "base/basictypes.h"
+#include "base/base64.h"
 #include "base/lock.h"
 #include "base/platform_thread.h"
 #include "base/scoped_ptr.h"
 #include "base/sha1.h"
 #include "base/string_util.h"
 #include "base/task.h"
 #include "base/utf_string_conversions.h"
 #include "chrome/browser/sync/engine/all_status.h"
 #include "chrome/browser/sync/engine/auth_watcher.h"
 #include "chrome/browser/sync/engine/change_reorder_buffer.h"
@@ skipping 350 matching lines @@
 
 std::string BaseNode::GenerateSyncableHash(
     syncable::ModelType model_type, const std::string& client_tag) {
   // blank PB with just the extension in it has termination symbol,
   // handy for delimiter
   sync_pb::EntitySpecifics serialized_type;
   syncable::AddDefaultExtensionValue(model_type, &serialized_type);
   std::string hash_input;
   serialized_type.AppendToString(&hash_input);
   hash_input.append(client_tag);
-  return HexEncode(hash_input.data(), hash_input.length());
+
+  std::string encode_output;
+  CHECK(base::Base64Encode(base::SHA1HashString(hash_input), &encode_output));
+  return encode_output;
 }
 
 int64 BaseNode::GetParentId() const {
   return IdToMetahandle(GetTransaction()->GetWrappedTrans(),
                         GetEntry()->Get(syncable::PARENT_ID));
 }
 
 int64 BaseNode::GetId() const {
   return GetEntry()->Get(syncable::META_HANDLE);
 }
@@ skipping 1452 matching lines @@
 BaseTransaction::~BaseTransaction() {
   delete lookup_;
 }
 
 UserShare* SyncManager::GetUserShare() const {
   DCHECK(data_->initialized()) << "GetUserShare requires initialization!";
   return data_->GetUserShare();
 }
 
 }  // namespace sync_api