[SyncFS] Use dedicated temporary directory in LocalFileChangeTrackerTest

chrome/browser/sync_file_system/local/local_file_change_tracker_unittest.cc

 // Copyright 2013 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 "chrome/browser/sync_file_system/local/local_file_change_tracker.h"
 
 #include <deque>
 #include <set>
 
 #include "base/basictypes.h"
@@ skipping 27 matching lines @@
   LocalFileChangeTrackerTest()
       : in_memory_env_(leveldb::NewMemEnv(leveldb::Env::Default())),
         file_system_(GURL("http://example.com"),
                      in_memory_env_.get(),
                      base::ThreadTaskRunnerHandle::Get().get(),
                      base::ThreadTaskRunnerHandle::Get().get()) {}
 
   virtual void SetUp() OVERRIDE {
     file_system_.SetUp(CannedSyncableFileSystem::QUOTA_ENABLED);
 
+    ASSERT_TRUE(base_dir_.CreateUniqueTempDir());
     sync_context_ =
-        new LocalFileSyncContext(base::FilePath(),
+        new LocalFileSyncContext(base_dir_.path(),
                                  in_memory_env_.get(),
                                  base::ThreadTaskRunnerHandle::Get().get(),
                                  base::ThreadTaskRunnerHandle::Get().get());
     ASSERT_EQ(
         sync_file_system::SYNC_STATUS_OK,
         file_system_.MaybeInitializeFileSystemContext(sync_context_.get()));
   }
 
   virtual void TearDown() OVERRIDE {
     if (sync_context_.get())
@@ skipping 43 matching lines @@
 
   void RestoreChangesFromTrackerDB() {
     change_tracker()->CollectLastDirtyChanges(file_system_context());
   }
 
   void GetAllChangedURLs(fileapi::FileSystemURLSet* urls) {
     change_tracker()->GetAllChangedURLs(urls);
   }
 
   base::MessageLoopForIO message_loop_;
+  base::ScopedTempDir base_dir_;
   scoped_ptr<leveldb::Env> in_memory_env_;
   CannedSyncableFileSystem file_system_;
 
  private:
   scoped_refptr<LocalFileSyncContext> sync_context_;
 
   DISALLOW_COPY_AND_ASSIGN(LocalFileChangeTrackerTest);
 };
 
 TEST_F(LocalFileChangeTrackerTest, GetChanges) {
@@ skipping 553 matching lines @@
 
   // Make sure they're gone from the database too.
   DropChangesInTracker();
   RestoreChangesFromTrackerDB();
 
   GetAllChangedURLs(&urls);
   EXPECT_TRUE(urls.empty());
 }
 
 }  // namespace sync_file_system