Revert of [Sync] Erase sync DB when corrupted

sync/syncable/directory_unittest.cc

Index: sync/syncable/directory_unittest.cc
diff --git a/sync/syncable/directory_unittest.cc b/sync/syncable/directory_unittest.cc
index 690af4ff4d6993b190872508f07e230f6db2296a..d802d4f2ccf5624e6af0dba22d1d4dbac748d52c 100644
--- a/sync/syncable/directory_unittest.cc
+++ b/sync/syncable/directory_unittest.cc
@@ -12,7 +12,6 @@
 #include "sync/syncable/syncable_write_transaction.h"
 #include "sync/test/engine/test_syncable_utils.h"
 #include "sync/test/test_directory_backing_store.h"
-#include "sync/util/mock_unrecoverable_error_handler.h"
 
 using base::ExpectDictBooleanValue;
 using base::ExpectDictStringValue;
@@ -2031,25 +2030,6 @@
   snapshot.delete_journals_to_purge.clear();
 }
 
-// Verify that Directory triggers an unrecoverable error when a catastrophic
-// DirectoryBackingStore error is detected.
-TEST_F(SyncableDirectoryTest, CatastrophicError) {
-  MockUnrecoverableErrorHandler unrecoverable_error_handler;
-  Directory dir(new InMemoryDirectoryBackingStore("catastrophic_error"),
-                &unrecoverable_error_handler, nullptr, nullptr, nullptr);
-  ASSERT_EQ(OPENED, dir.Open(kDirectoryName, directory_change_delegate(),
-                             NullTransactionObserver()));
-  ASSERT_EQ(0, unrecoverable_error_handler.invocation_count());
-
-  // Fire off two catastrophic errors. Call it twice to ensure Directory is
-  // tolerant of multiple invocations since that may happen in the real world.
-  dir.OnCatastrophicError();
-  dir.OnCatastrophicError();
-
-  // See that the unrecoverable error handler has been invoked twice.
-  ASSERT_EQ(2, unrecoverable_error_handler.invocation_count());
-}
-
 }  // namespace syncable
 
 }  // namespace syncer