[FileAPI] Replace default leveldb::Env with leveldb::MemEnv in tests.

chrome/browser/sync_file_system/local/canned_syncable_file_system.h

 // 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.
 
 #ifndef CHROME_BROWSER_SYNC_FILE_SYSTEM_LOCAL_CANNED_SYNCABLE_FILE_SYSTEM_H_
 #define CHROME_BROWSER_SYNC_FILE_SYSTEM_LOCAL_CANNED_SYNCABLE_FILE_SYSTEM_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 17 matching lines @@
 class SingleThreadTaskRunner;
 class Thread;
 }
 
 namespace fileapi {
 class FileSystemContext;
 class FileSystemOperationRunner;
 class FileSystemURL;
 }
 
+namespace leveldb {
+class Env;
+}
+
 namespace net {
 class URLRequestContext;
 }
 
 namespace quota {
 class QuotaManager;
 }
 
 namespace sync_file_system {
 
 class FileChangeList;
 class LocalFileSyncContext;
 class SyncFileSystemBackend;
 
 // A canned syncable filesystem for testing.
 // This internally creates its own QuotaManager and FileSystemContext
 // (as we do so for each isolated application).
 class CannedSyncableFileSystem
     : public LocalFileSyncStatus::Observer {
  public:
   typedef base::Callback<void(const GURL& root,
                               const std::string& name,
                               base::File::Error result)>
       OpenFileSystemCallback;
   typedef base::Callback<void(base::File::Error)> StatusCallback;
   typedef base::Callback<void(int64)> WriteCallback;
   typedef fileapi::FileSystemOperation::FileEntryList FileEntryList;
 
   CannedSyncableFileSystem(const GURL& origin,
+                           leveldb::Env* env_override,
                            base::SingleThreadTaskRunner* io_task_runner,
                            base::SingleThreadTaskRunner* file_task_runner);
   virtual ~CannedSyncableFileSystem();
 
   // SetUp must be called before using this instance.
   void SetUp();
 
   // TearDown must be called before destructing this instance.
   void TearDown();
 
@@ skipping 141 matching lines @@
   const std::string service_name_;
 
   scoped_refptr<quota::QuotaManager> quota_manager_;
   scoped_refptr<fileapi::FileSystemContext> file_system_context_;
   const GURL origin_;
   const fileapi::FileSystemType type_;
   GURL root_url_;
   base::File::Error result_;
   sync_file_system::SyncStatusCode sync_status_;
 
+  leveldb::Env* env_override_;
   scoped_refptr<base::SingleThreadTaskRunner> io_task_runner_;
   scoped_refptr<base::SingleThreadTaskRunner> file_task_runner_;
 
   // Boolean flags mainly for helping debug.
   bool is_filesystem_set_up_;
   bool is_filesystem_opened_;  // Should be accessed only on the IO thread.
 
   scoped_refptr<ObserverList> sync_status_observers_;
 
   DISALLOW_COPY_AND_ASSIGN(CannedSyncableFileSystem);
 };
 
 }  // namespace sync_file_system
 
 #endif  // CHROME_BROWSER_SYNC_FILE_SYSTEM_LOCAL_CANNED_SYNCABLE_FILE_SYSTEM_H_