Rewrite std::string("") to std::string(), Linux edition.

base/values_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 <limits>
 
 #include "base/memory/scoped_ptr.h"
 #include "base/string16.h"
 #include "base/utf_string_conversions.h"
 #include "base/values.h"
@@ skipping 581 matching lines @@
   // Remove empty lists and dictionaries.
   root->Set("empty_dict", new DictionaryValue);
   root->Set("empty_list", new ListValue);
   root->SetWithoutPathExpansion("a.b.c.d.e", new DictionaryValue);
   root.reset(root->DeepCopyWithoutEmptyChildren());
   EXPECT_TRUE(root->empty());
 
   // Make sure we don't prune too much.
   root->SetBoolean("bool", true);
   root->Set("empty_dict", new DictionaryValue);
-  root->SetString("empty_string", "");
+  root->SetString("empty_string", std::string());
   root.reset(root->DeepCopyWithoutEmptyChildren());
   EXPECT_EQ(2U, root->size());
 
   // Should do nothing.
   root.reset(root->DeepCopyWithoutEmptyChildren());
   EXPECT_EQ(2U, root->size());
 
   // Nested test cases.  These should all reduce back to the bool and string
   // set above.
   {
@@ skipping 156 matching lines @@
       seen2 = true;
     } else {
       ADD_FAILURE();
     }
   }
   EXPECT_TRUE(seen1);
   EXPECT_TRUE(seen2);
 }
 
 }  // namespace base