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

extensions/common/matcher/url_matcher_factory.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 "extensions/common/matcher/url_matcher_factory.h"
 
 #include <algorithm>
 #include <cctype>
 
 #include "base/lazy_instance.h"
@@ skipping 133 matching lines @@
       return scoped_refptr<URLMatcherConditionSet>(NULL);
     }
   }
 
   // As the URL is the preliminary matching criterion that triggers the tests
   // for the remaining condition attributes, we insert an empty URL match if
   // no other url match conditions were specified. Such an empty URL is always
   // matched.
   if (url_matcher_conditions.empty()) {
     url_matcher_conditions.insert(
-        url_matcher_condition_factory->CreateHostPrefixCondition(""));
+        url_matcher_condition_factory->CreateHostPrefixCondition(
+            std::string()));
   }
 
   scoped_refptr<URLMatcherConditionSet> url_matcher_condition_set(
       new URLMatcherConditionSet(id, url_matcher_conditions,
           url_matcher_schema_filter.Pass(), url_matcher_port_filter.Pass()));
   return url_matcher_condition_set;
 }
 
 // static
 bool URLMatcherFactory::IsURLMatcherConditionAttribute(
@@ skipping 99 matching lines @@
     } else {
       *error = kInvalidPortRanges;
       return scoped_ptr<URLMatcherPortFilter>(NULL);
     }
   }
 
   return scoped_ptr<URLMatcherPortFilter>(new URLMatcherPortFilter(ranges));
 }
 
 }  // namespace extensions