Use base64 SHA1 hash for sync IDs

chrome/browser/sync/engine/syncapi.cc

Index: chrome/browser/sync/engine/syncapi.cc
diff --git a/chrome/browser/sync/engine/syncapi.cc b/chrome/browser/sync/engine/syncapi.cc
index 7539e2b09770f2c2333e692ea6c30e53f532a3c2..6be8c11321cf6061dc45e970581e7fc9f30ccbba 100755
--- a/chrome/browser/sync/engine/syncapi.cc
+++ b/chrome/browser/sync/engine/syncapi.cc
@@ -29,6 +29,7 @@
 #include <vector>
 
 #include "base/basictypes.h"
+#include "base/base64.h"
 #include "base/lock.h"
 #include "base/platform_thread.h"
 #include "base/scoped_ptr.h"
@@ -399,7 +400,10 @@ std::string BaseNode::GenerateSyncableHash(
   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 {