Rewrite scoped_ptr<T>(NULL) to use the default ctor.

base/android/activity_status_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 "base/android/activity_status.h"
 #include "base/bind.h"
 #include "base/callback_forward.h"
 #include "base/logging.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/message_loop/message_loop_proxy.h"
@@ skipping 25 matching lines @@
 // Shared state for the multi-threaded test.
 // This uses a thread to register for events and listen to them, while state
 // changes are forced on the main thread.
 class MultiThreadedTest {
  public:
   MultiThreadedTest()
       : activity_status_(ActivityStatus::GetInstance()),
         state_(kInvalidActivityState),
         event_(false, false),
         thread_("ActivityStatusTest thread"),
-        main_(),
-        listener_(NULL) {
+        main_() {
   }
 
   void Run() {
     // Start the thread and tell it to register for events.
     thread_.Start();
     thread_.message_loop()
         ->PostTask(FROM_HERE,
                    base::Bind(&MultiThreadedTest::RegisterThreadForEvents,
                               base::Unretained(this)));
 
@@ skipping 62 matching lines @@
   EXPECT_EQ(ACTIVITY_STATE_DESTROYED, result);
 }
 
 TEST(ActivityStatusTest, TwoThreads) {
   MultiThreadedTest test;
   test.Run();
 }
 
 }  // namespace android
 }  // namespace base