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

webkit/renderer/dom_storage/dom_storage_cached_area_unittest.cc

 // Copyright (c) 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 <list>
 
 #include "base/bind.h"
 #include "base/strings/utf_string_conversions.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "webkit/renderer/dom_storage/dom_storage_cached_area.h"
@@ skipping 302 matching lines @@
   const int kConnectionId = 8;
   scoped_refptr<DomStorageCachedArea> cached_area =
       new DomStorageCachedArea(kNamespaceId, kOrigin, mock_proxy_.get());
 
   // SetItem
   EXPECT_TRUE(cached_area->SetItem(kConnectionId, kKey, kValue, kPageUrl));
   mock_proxy_->CompleteOnePendingCallback(true);  // load completion
   EXPECT_FALSE(IsIgnoringAllMutations(cached_area.get()));
   EXPECT_TRUE(IsIgnoringKeyMutations(cached_area.get(), kKey));
   cached_area->ApplyMutation(base::NullableString16(kKey, false),
-                             base::NullableString16(true));
+                             base::NullableString16());
   EXPECT_EQ(kValue, cached_area->GetItem(kConnectionId, kKey).string());
   mock_proxy_->CompleteOnePendingCallback(true);  // set completion
   EXPECT_FALSE(IsIgnoringKeyMutations(cached_area.get(), kKey));
 
   // RemoveItem
   cached_area->RemoveItem(kConnectionId, kKey, kPageUrl);
   EXPECT_TRUE(IsIgnoringKeyMutations(cached_area.get(), kKey));
   mock_proxy_->CompleteOnePendingCallback(true);  // remove completion
   EXPECT_FALSE(IsIgnoringKeyMutations(cached_area.get(), kKey));
 
   // Multiple mutations to the same key.
   EXPECT_TRUE(cached_area->SetItem(kConnectionId, kKey, kValue, kPageUrl));
   cached_area->RemoveItem(kConnectionId, kKey, kPageUrl);
   EXPECT_TRUE(IsIgnoringKeyMutations(cached_area.get(), kKey));
   mock_proxy_->CompleteOnePendingCallback(true);  // set completion
   EXPECT_TRUE(IsIgnoringKeyMutations(cached_area.get(), kKey));
   mock_proxy_->CompleteOnePendingCallback(true);  // remove completion
   EXPECT_FALSE(IsIgnoringKeyMutations(cached_area.get(), kKey));
 
   // A failed set item operation should Reset the cache.
   EXPECT_TRUE(cached_area->SetItem(kConnectionId, kKey, kValue, kPageUrl));
   EXPECT_TRUE(IsIgnoringKeyMutations(cached_area.get(), kKey));
   mock_proxy_->CompleteOnePendingCallback(false);
   EXPECT_FALSE(IsPrimed(cached_area.get()));
 }
 
 }  // namespace dom_storage