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

chrome/browser/download/download_history_unittest.cc

Index: chrome/browser/download/download_history_unittest.cc
diff --git a/chrome/browser/download/download_history_unittest.cc b/chrome/browser/download/download_history_unittest.cc
index fd5e41dd7f74cad4f1f080e918e4cdd554115813..39129df494071607e788ee6c657f2ff4c2c3e839 100644
--- a/chrome/browser/download/download_history_unittest.cc
+++ b/chrome/browser/download/download_history_unittest.cc
@@ -198,14 +198,12 @@ class FakeHistoryAdapter : public DownloadHistory::HistoryAdapter {
 class DownloadHistoryTest : public testing::Test {
  public:
   DownloadHistoryTest()
-    : ui_thread_(content::BrowserThread::UI, &loop_),
-      manager_(new content::MockDownloadManager()),
-      history_(NULL),
-      download_history_(NULL),
-      manager_observer_(NULL),
-      item_observer_(NULL),
-      download_created_index_(0) {
-  }
+      : ui_thread_(content::BrowserThread::UI, &loop_),
+        manager_(new content::MockDownloadManager()),
+        history_(NULL),
+        manager_observer_(NULL),
+        item_observer_(NULL),
+        download_created_index_(0) {}
   virtual ~DownloadHistoryTest() {
     STLDeleteElements(&items_);
   }