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

chrome/browser/chromeos/drive/local_file_reader_unittest.cc

Index: chrome/browser/chromeos/drive/local_file_reader_unittest.cc
diff --git a/chrome/browser/chromeos/drive/local_file_reader_unittest.cc b/chrome/browser/chromeos/drive/local_file_reader_unittest.cc
index dd8acf4cc19e846649f2b313ccea367f8d7bf28b..0af9c0a4a814653155a7907ecc3f7d9f7b875568 100644
--- a/chrome/browser/chromeos/drive/local_file_reader_unittest.cc
+++ b/chrome/browser/chromeos/drive/local_file_reader_unittest.cc
@@ -44,9 +44,6 @@ class LocalFileReaderAdapter {
 
 class LocalFileReaderTest : public ::testing::Test {
  protected:
-  LocalFileReaderTest() {
-  }
-
   virtual void SetUp() OVERRIDE {
     ASSERT_TRUE(temp_dir_.CreateUniqueTempDir());
     worker_thread_.reset(new base::Thread("LocalFileReaderTest"));
@@ -55,11 +52,6 @@ class LocalFileReaderTest : public ::testing::Test {
         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_;