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

chrome/browser/ui/search/instant_controller_unittest.cc

 // Copyright (c) 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/memory/scoped_ptr.h"
 #include "base/message_loop.h"
 #include "base/metrics/histogram.h"
 #include "base/metrics/histogram_samples.h"
 #include "base/metrics/statistics_recorder.h"
 #include "chrome/browser/ui/search/instant_controller.h"
@@ skipping 32 matching lines @@
   std::string test_instant_url_;
   bool test_supports_instant_;
   bool test_is_local_;
 };
 
 class TestableInstantController : public InstantController {
  public:
   TestableInstantController()
       : InstantController(NULL, true),
         test_instant_url_("http://test_url"),
-        test_extended_enabled_(true),
-        test_overlay_(NULL) {
-  }
+        test_extended_enabled_(true) {}
 
   // Overrides from InstantController
   virtual std::string GetInstantURL() const OVERRIDE {
     return test_instant_url_;
   }
 
   virtual bool extended_enabled() const OVERRIDE {
     return test_extended_enabled_;
   }
 
@@ skipping 72 matching lines @@
   instant_controller()->set_instant_url(instant_url);
   test_overlay->set_supports_instant(false);
   fallback_reason = instant_controller()->ShouldSwitchToLocalOverlay();
   ASSERT_EQ(fallback_reason,
             InstantController::INSTANT_FALLBACK_INSTANT_NOT_SUPPORTED);
 
   test_overlay->set_supports_instant(true);
   fallback_reason = instant_controller()->ShouldSwitchToLocalOverlay();
   ASSERT_EQ(fallback_reason, InstantController::INSTANT_FALLBACK_NONE);
 }