Added WARN_UNUSED_RESULT to ScopedTempDir methods.

chrome/browser/process_singleton_mac_unittest.cc

 // Copyright (c) 2010 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 <errno.h>
 #include <fcntl.h>
 #include <sys/file.h>
 
 #include "chrome/browser/process_singleton.h"
 
 #include "base/eintr_wrapper.h"
 #include "base/file_util.h"
 #include "base/path_service.h"
 #include "chrome/common/chrome_constants.h"
 #include "chrome/common/chrome_paths.h"
 #include "chrome/test/testing_profile.h"
 #include "testing/platform_test.h"
 
 namespace {
 
 class ProcessSingletonMacTest : public PlatformTest {
  public:
   virtual void SetUp() {
     PlatformTest::SetUp();
 
     // Put the lock in a temporary directory.  Doesn't need to be a
     // full profile to test this code.
-    temp_dir_.CreateUniqueTempDir();
-    ASSERT_TRUE(temp_dir_.IsValid());
+    ASSERT_TRUE(temp_dir_.CreateUniqueTempDir());
     lock_path_ = temp_dir_.path().Append(chrome::kSingletonLockFilename);
   }
 
   virtual void TearDown() {
     PlatformTest::TearDown();
 
     // Verify that the lock was released.
     EXPECT_FALSE(IsLocked());
   }
 
@@ skipping 100 matching lines @@
   ps2.Cleanup();
   EXPECT_FALSE(IsLocked());
 }
 
 // TODO(shess): Test that the lock is released when the process dies.
 // DEATH_TEST?  I don't know.  If the code to communicate between
 // browser processes is ever written, this all would need to be tested
 // more like the other platforms, in which case it would be easy.
 
 }  // namespace