Remove destruction-only TearDown() methods in Drive related test.

chrome/browser/chromeos/drive/local_file_reader_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/chromeos/drive/local_file_reader.h"
 
 #include <string>
 
 #include "base/files/file_path.h"
 #include "base/files/scoped_temp_dir.h"
@@ skipping 26 matching lines @@
   }
 
  private:
   LocalFileReader* reader_;
 };
 
 }  // namespace
 
 class LocalFileReaderTest : public ::testing::Test {
  protected:
-  LocalFileReaderTest() {
-  }
-
   virtual void SetUp() OVERRIDE {
     ASSERT_TRUE(temp_dir_.CreateUniqueTempDir());
     worker_thread_.reset(new base::Thread("LocalFileReaderTest"));
     ASSERT_TRUE(worker_thread_->Start());
     file_reader_.reset(
         new LocalFileReader(worker_thread_->message_loop_proxy()));
   }
 
-  virtual void TearDown() OVERRIDE {
-    file_reader_.reset();
-    worker_thread_.reset();
-  }
-
   base::MessageLoop message_loop_;
   base::ScopedTempDir temp_dir_;
   scoped_ptr<base::Thread> worker_thread_;
   scoped_ptr<LocalFileReader> file_reader_;
 };
 
 TEST_F(LocalFileReaderTest, NonExistingFile) {
   const base::FilePath kTestFile =
       temp_dir_.path().AppendASCII("non-existing");
 
@@ skipping 33 matching lines @@
   ASSERT_EQ(net::OK, callback.WaitForResult());
 
   LocalFileReaderAdapter adapter(file_reader_.get());
   std::string content;
   ASSERT_EQ(net::OK, test_util::ReadAllData(&adapter, &content));
   EXPECT_EQ(expected_content, content);
 }
 
 }  // namespace util
 }  // namespace drive