Added WARN_UNUSED_RESULT to ScopedTempDir methods.

chrome/browser/process_singleton_uitest.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.
 
 // This test validates that the ProcessSingleton class properly makes sure
 // that there is only one main browser process.
 //
 // It is currently compiled and run on Windows and Posix(non-Mac) platforms.
 // Mac uses system services and ProcessSingletonMac is a noop.  (Maybe it still
 // makes sense to test that the system services are giving the behavior we
@@ skipping 118 matching lines @@
   DISALLOW_COPY_AND_ASSIGN(ChromeStarter);
 };
 
 // Our test fixture that initializes and holds onto a few global vars.
 class ProcessSingletonTest : public UITest {
  public:
   ProcessSingletonTest()
       // We use a manual reset so that all threads wake up at once when signaled
       // and thus we must manually reset it for each attempt.
       : threads_waker_(true /* manual */, false /* signaled */) {
-    temp_profile_dir_.CreateUniqueTempDir();
+    EXPECT_TRUE(temp_profile_dir_.CreateUniqueTempDir());
   }
 
   void SetUp() {
     // Start the threads and create the starters.
     for (size_t i = 0; i < kNbThreads; ++i) {
       chrome_starter_threads_[i].reset(new base::Thread("ChromeStarter"));
       ASSERT_TRUE(chrome_starter_threads_[i]->Start());
       chrome_starters_[i] = new ChromeStarter(action_max_timeout_ms(),
                                               temp_profile_dir_.path());
     }
@@ skipping 167 matching lines @@
     pending_starters.empty();
     if (chrome_starters_[last_index]->process_handle_ !=
         base::kNullProcessHandle) {
       KillProcessTree(chrome_starters_[last_index]->process_handle_);
       chrome_starters_[last_index]->done_event_.Wait();
     }
   }
 }
 
 }  // namespace