webkit: Instead of doing a conversion just use string16().

webkit/dom_storage/dom_storage_database_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 "webkit/dom_storage/dom_storage_database.h"
 
 #include "base/file_path.h"
 #include "base/file_util.h"
 #include "base/path_service.h"
 #include "base/scoped_temp_dir.h"
@@ skipping 73 matching lines @@
   string16 kCannedKeys[] = {
       ASCIIToUTF16("test"),
       ASCIIToUTF16("company"),
       ASCIIToUTF16("date"),
       ASCIIToUTF16("empty")
   };
   NullableString16 kCannedValues[] = {
       NullableString16(ASCIIToUTF16("123"), false),
       NullableString16(ASCIIToUTF16("Google"), false),
       NullableString16(ASCIIToUTF16("18-01-2012"), false),
-      NullableString16(ASCIIToUTF16(""), false)
+      NullableString16(string16(), false)
   };
   for (unsigned i = 0; i < sizeof(kCannedKeys) / sizeof(kCannedKeys[0]); i++)
     (*values)[kCannedKeys[i]] = kCannedValues[i];
 }
 
 TEST(DomStorageDatabaseTest, SimpleOpenAndClose) {
   DomStorageDatabase db;
   EXPECT_FALSE(db.IsOpen());
   ASSERT_TRUE(db.LazyOpen(true));
   EXPECT_TRUE(db.IsOpen());
@@ skipping 262 matching lines @@
 
     db.ReadAllValues(&values);
     EXPECT_EQ(0u, values.size());
     EXPECT_FALSE(db.IsOpen());
 
     EXPECT_TRUE(file_util::PathExists(temp_dir.path()));
   }
 }
 
 }  // namespace dom_storage