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

chrome/browser/content_settings/content_settings_utils_unittest.cc

 // Copyright (c) 2011 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 "chrome/browser/content_settings/content_settings_utils.h"
 
 #include <string>
 
 #include "testing/gtest/include/gtest/gtest.h"
 
 TEST(ContentSettingsUtilsTest, ParsePatternString) {
   content_settings::PatternPair pattern_pair;
 
-  pattern_pair = content_settings::ParsePatternString("");
+  pattern_pair = content_settings::ParsePatternString(std::string());
   EXPECT_FALSE(pattern_pair.first.IsValid());
   EXPECT_FALSE(pattern_pair.second.IsValid());
 
   pattern_pair = content_settings::ParsePatternString(",");
   EXPECT_FALSE(pattern_pair.first.IsValid());
   EXPECT_FALSE(pattern_pair.second.IsValid());
 
   pattern_pair = content_settings::ParsePatternString("http://www.foo.com");
   EXPECT_TRUE(pattern_pair.first.IsValid());
   EXPECT_EQ(pattern_pair.second, ContentSettingsPattern::Wildcard());
@@ skipping 11 matching lines @@
   pattern_pair = content_settings::ParsePatternString(
       "http://www.foo.com,http://www.bar.com,");
   EXPECT_FALSE(pattern_pair.first.IsValid());
   EXPECT_FALSE(pattern_pair.second.IsValid());
 
   pattern_pair = content_settings::ParsePatternString(
       "http://www.foo.com,http://www.bar.com,http://www.error.com");
   EXPECT_FALSE(pattern_pair.first.IsValid());
   EXPECT_FALSE(pattern_pair.second.IsValid());
 }