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

base/process_util_linux.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 "base/process_util.h"
 
 #include <dirent.h>
 #include <malloc.h>
 #include <sys/time.h>
 #include <sys/types.h>
@@ skipping 143 matching lines @@
 
 // Reads the |field_num|th field from |proc_stats|.
 // Returns an empty string on failure.
 // This version only handles VM_COMM and VM_STATE, which are the only fields
 // that are strings.
 std::string GetProcStatsFieldAsString(
     const std::vector<std::string>& proc_stats,
     ProcStatsFields field_num) {
   if (field_num < VM_COMM || field_num > VM_STATE) {
     NOTREACHED();
-    return "";
+    return std::string();
   }
 
   if (proc_stats.size() > static_cast<size_t>(field_num))
     return proc_stats[field_num];
 
   NOTREACHED();
   return 0;
 }
 
 // Reads /proc/<pid>/cmdline and populates |proc_cmd_line_args| with the command
@@ skipping 707 matching lines @@
     int score_len = static_cast<int>(score_str.length());
     return (score_len == file_util::WriteFile(oom_file,
                                               score_str.c_str(),
                                               score_len));
   }
 
   return false;
 }
 
 }  // namespace base