Do not do unnecessary recursive deletes for files.

sync/syncable/syncable_unittest.cc

 // Copyright 2012 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 <string>
 
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
 #include "base/files/file_path.h"
 #include "base/files/file_util.h"
@@ skipping 139 matching lines @@
 // A variant of SyncableDirectoryTest that uses a real sqlite database.
 class OnDiskSyncableDirectoryTest : public SyncableDirectoryTest {
  protected:
   // SetUp() is called before each test case is run.
   // The sqlite3 DB is deleted before each test is run.
   void SetUp() override {
     SyncableDirectoryTest::SetUp();
     ASSERT_TRUE(temp_dir_.CreateUniqueTempDir());
     file_path_ = temp_dir_.path().Append(
         FILE_PATH_LITERAL("Test.sqlite3"));
-    base::DeleteFile(file_path_, true);
+    base::DeleteFile(file_path_, false);
     CreateDirectory();
   }
 
   void TearDown() override {
     // This also closes file handles.
     dir()->SaveChanges();
     dir().reset();
-    base::DeleteFile(file_path_, true);
+    base::DeleteFile(file_path_, false);
     SyncableDirectoryTest::TearDown();
   }
 
   // Creates a new directory.  Deletes the old directory, if it exists.
   void CreateDirectory() {
     test_directory_ = TestDirectory::Create(
         encryptor(),
         MakeWeakHandle(unrecoverable_error_handler()->GetWeakPtr()),
         kDirectoryName, file_path_);
     dir().reset(test_directory_);
@@ skipping 491 matching lines @@
 TEST_F(SyncableClientTagTest, TestClientTagIndexDuplicateServer) {
   EXPECT_TRUE(CreateWithDefaultTag(factory_.NewServerId(), true));
   EXPECT_FALSE(CreateWithDefaultTag(factory_.NewServerId(), true));
   EXPECT_FALSE(CreateWithDefaultTag(factory_.NewServerId(), false));
   EXPECT_FALSE(CreateWithDefaultTag(factory_.NewLocalId(), false));
   EXPECT_FALSE(CreateWithDefaultTag(factory_.NewLocalId(), true));
 }
 
 }  // namespace syncable
 }  // namespace syncer