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

chrome/browser/ui/search/instant_controller.cc

 // Copyright 2012 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 "chrome/browser/ui/search/instant_controller.h"
 
 #include <iterator>
 
 #include "base/metrics/histogram.h"
 #include "base/strings/string_util.h"
@@ skipping 522 matching lines @@
 bool InstantController::WillFetchCompletions() const {
   if (!extended_enabled())
     return false;
 
   return !UsingLocalPage();
 }
 
 scoped_ptr<content::WebContents> InstantController::ReleaseNTPContents() {
   if (!extended_enabled() || !browser_->profile() ||
       browser_->profile()->IsOffTheRecord())
-    return scoped_ptr<content::WebContents>(NULL);
+    return scoped_ptr<content::WebContents>();
 
   LOG_INSTANT_DEBUG_EVENT(this, "ReleaseNTPContents");
 
   if (ShouldSwitchToLocalNTP())
     ResetNTP(GetLocalInstantURL());
 
   scoped_ptr<content::WebContents> ntp_contents = ntp_->ReleaseContents();
 
   // Preload a new Instant NTP.
   if (preload_ntp_)
@@ skipping 1292 matching lines @@
   result->transition = match.transition;
   result->relevance = match.relevance;
   result->autocomplete_match_index = autocomplete_match_index;
 
   DVLOG(1) << "    " << result->relevance << " "
       << UTF8ToUTF16(AutocompleteMatchType::ToString(result->type)) << " "
       << result->provider << " " << result->destination_url << " '"
       << result->description << "' '" << result->search_query << "' "
       << result->transition <<  " " << result->autocomplete_match_index;
 }