[Sync] Move change-related methods out of SyncManager::Observer

chrome/browser/sync/test/null_directory_change_delegate.cc

Index: chrome/browser/sync/test/null_directory_change_delegate.cc
diff --git a/chrome/browser/sync/test/null_directory_change_delegate.cc b/chrome/browser/sync/test/null_directory_change_delegate.cc
index 804eb914311b63d51009431631f00f73431c5940..2a32f97595203a05d73f0bc1912996a477d74318 100644
--- a/chrome/browser/sync/test/null_directory_change_delegate.cc
+++ b/chrome/browser/sync/test/null_directory_change_delegate.cc
@@ -9,15 +9,17 @@ namespace syncable {
 NullDirectoryChangeDelegate::~NullDirectoryChangeDelegate() {}
 
 void NullDirectoryChangeDelegate::HandleCalculateChangesChangeEventFromSyncApi(
-    const EntryKernelMutationMap& mutations,
+    const ImmutableWriteTransactionInfo& write_transaction_info,
     BaseTransaction* trans) {}
 
 void NullDirectoryChangeDelegate::HandleCalculateChangesChangeEventFromSyncer(
-    const EntryKernelMutationMap& mutations,
+    const ImmutableWriteTransactionInfo& write_transaction_info,
     BaseTransaction* trans) {}
 
-ModelTypeBitSet NullDirectoryChangeDelegate::HandleTransactionEndingChangeEvent(
-      BaseTransaction* trans) {
+ModelTypeBitSet
+    NullDirectoryChangeDelegate::HandleTransactionEndingChangeEvent(
+        const ImmutableWriteTransactionInfo& write_transaction_info,
+        BaseTransaction* trans) {
   return ModelTypeBitSet();
 }