Replace base::NullableString16(bool) usage with default constructor.

webkit/browser/dom_storage/dom_storage_database_unittest.cc

Index: webkit/browser/dom_storage/dom_storage_database_unittest.cc
diff --git a/webkit/browser/dom_storage/dom_storage_database_unittest.cc b/webkit/browser/dom_storage/dom_storage_database_unittest.cc
index f61b53b137abc99a22304627326e3c5d057d7c62..4d8db911a2aff3f449a667a4d2734f1069803afb 100644
--- a/webkit/browser/dom_storage/dom_storage_database_unittest.cc
+++ b/webkit/browser/dom_storage/dom_storage_database_unittest.cc
@@ -157,7 +157,7 @@ TEST(DomStorageDatabaseTest, CloseEmptyDatabaseDeletesFile) {
     ASSERT_TRUE(db.CommitChanges(false, storage));
     ValuesMap::iterator it = storage.begin();
     for (; it != storage.end(); ++it)
-      it->second = base::NullableString16(true);
+      it->second = base::NullableString16();
     ASSERT_TRUE(db.CommitChanges(false, storage));
   }
   EXPECT_FALSE(file_util::PathExists(file_name));
@@ -297,7 +297,7 @@ TEST(DomStorageDatabaseTest, TestSimpleRemoveOneValue) {
   ValuesMap values;
   // A null string in the map should mean that that key gets
   // removed.
-  values[kCannedKey] = base::NullableString16(true);
+  values[kCannedKey] = base::NullableString16();
   EXPECT_TRUE(db.CommitChanges(false, values));
 
   expected.clear();