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

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"
 #include "base/files/scoped_temp_dir.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/message_loop/message_loop.h"
 #include "base/message_loop/message_loop_proxy.h"
 #include "base/stl_util.h"
 #include "chrome/browser/sync_file_system/local/canned_syncable_file_system.h"
 #include "chrome/browser/sync_file_system/local/local_file_sync_context.h"
 #include "chrome/browser/sync_file_system/local/sync_file_system_backend.h"
 #include "chrome/browser/sync_file_system/sync_status_code.h"
 #include "chrome/browser/sync_file_system/syncable_file_system_util.h"
 #include "content/public/test/mock_blob_url_request_context.h"
 #include "testing/gtest/include/gtest/gtest.h"
+#include "third_party/leveldatabase/src/helpers/memenv/memenv.h"
+#include "third_party/leveldatabase/src/include/leveldb/env.h"
 #include "webkit/browser/fileapi/file_system_context.h"
 #include "webkit/browser/quota/quota_manager.h"
 
 using fileapi::FileSystemContext;
 using fileapi::FileSystemURL;
 using fileapi::FileSystemURLSet;
 using content::MockBlobURLRequestContext;
 using content::ScopedTextBlob;
 
 namespace sync_file_system {
 
 class LocalFileChangeTrackerTest : public testing::Test {
  public:
   LocalFileChangeTrackerTest()
-      : file_system_(GURL("http://example.com"),
+      : in_memory_env_(leveldb::NewMemEnv(leveldb::Env::Default())),
+        file_system_(GURL("http://example.com"),
+                     in_memory_env_.get(),
                      base::MessageLoopProxy::current().get(),
                      base::MessageLoopProxy::current().get()) {}
 
   virtual void SetUp() OVERRIDE {
     file_system_.SetUp();
 
     sync_context_ =
         new LocalFileSyncContext(base::FilePath(),
+                                 in_memory_env_.get(),
                                  base::MessageLoopProxy::current().get(),
                                  base::MessageLoopProxy::current().get());
     ASSERT_EQ(
         sync_file_system::SYNC_STATUS_OK,
         file_system_.MaybeInitializeFileSystemContext(sync_context_.get()));
   }
 
   virtual void TearDown() OVERRIDE {
     if (sync_context_.get())
       sync_context_->ShutdownOnUIThread();
@@ skipping 43 matching lines @@
   void RestoreChangesFromTrackerDB() {
     change_tracker()->CollectLastDirtyChanges(file_system_context());
   }
 
   void GetAllChangedURLs(fileapi::FileSystemURLSet* urls) {
     change_tracker()->GetAllChangedURLs(urls);
   }
 
   ScopedEnableSyncFSDirectoryOperation enable_directory_operation_;
   base::MessageLoopForIO message_loop_;
+  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) {
   EXPECT_EQ(base::File::FILE_OK, file_system_.OpenFileSystem());
@@ skipping 552 matching lines @@
 
   // Make sure they're gone from the database too.
   DropChangesInTracker();
   RestoreChangesFromTrackerDB();
 
   GetAllChangedURLs(&urls);
   EXPECT_TRUE(urls.empty());
 }
 
 }  // namespace sync_file_system