[Sync] Stop deleting LevelDB files when deleting Directory

components/sync/syncable/directory.cc

Index: components/sync/syncable/directory.cc
diff --git a/components/sync/syncable/directory.cc b/components/sync/syncable/directory.cc
index 42fd457bc24b81b35816b68cd3b36cb4f32882b1..d8f708ed8defdb504e69e9f886c3b6bc8e2fa265 100644
--- a/components/sync/syncable/directory.cc
+++ b/components/sync/syncable/directory.cc
@@ -11,7 +11,9 @@
 #include <utility>
 
 #include "base/base64.h"
+#include "base/files/file_enumerator.h"
 #include "base/guid.h"
+#include "base/logging.h"
 #include "base/memory/ptr_util.h"
 #include "base/metrics/histogram_macros.h"
 #include "base/strings/string_number_conversions.h"
@@ -432,6 +434,23 @@ bool Directory::ReindexParentId(BaseWriteTransaction* trans,
   return true;
 }
 
+// static
+void Directory::DeleteDirectoryFiles(const base::FilePath& directory_path) {
+  // We assume that the directory database files are all top level files, and
+  // use no folders. We also assume that there might be child folders under
+  // |directory_path| that are used for non-directory things, like storing
+  // ModelTypeStore/LevelDB data, and we expressly do not want to delete those.
+  if (base::DirectoryExists(directory_path)) {
+    base::FileEnumerator fe(directory_path, false, base::FileEnumerator::FILES);
+    for (base::FilePath current = fe.Next(); !current.empty();
+         current = fe.Next()) {
+      if (!base::DeleteFile(current, false)) {
+        LOG(DFATAL) << "Could not delete all sync directory files.";
+      }
+    }
+  }
+}
+
 void Directory::RemoveFromAttachmentIndex(
     const ScopedKernelLock& lock,
     const int64_t metahandle,