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

ppapi/native_client/src/trusted/plugin/plugin_error.h

 /*
  * 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.
  */
 
 /*
  * Error codes and data structures used to report errors when loading a nexe.
  */
 
@@ skipping 91 matching lines @@
   ERROR_MAX
 };
 
 class ErrorInfo {
  public:
   ErrorInfo() {
     Reset();
   }
 
   void Reset() {
-    SetReport(ERROR_UNKNOWN, "");
+    SetReport(ERROR_UNKNOWN, std::string());
   }
 
   void SetReport(PluginErrorCode error_code, const std::string& message) {
     error_code_ = error_code;
     message_ = message;
   }
 
   PluginErrorCode error_code() const {
     return error_code_;
   }
 
   void PrependMessage(const std::string& prefix) {
     message_ = prefix + message_;
   }
 
   const std::string& message() const {
     return message_;
   }
 
  private:
   PluginErrorCode error_code_;
   std::string message_;
   NACL_DISALLOW_COPY_AND_ASSIGN(ErrorInfo);
 };
 
 }  // namespace plugin
 
 #endif  // NATIVE_CLIENT_SRC_TRUSTED_PLUGIN_PLUGIN_ERROR_H