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

content/renderer/date_time_formatter.cc

 // Copyright (c) 2013 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 "content/renderer/date_time_formatter.h"
 
 #include "base/string_util.h"
 #include "base/utf_string_conversions.h"
 #include "third_party/WebKit/Source/Platform/chromium/public/WebCString.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebDateTimeChooserParams.h"
@@ skipping 77 matching lines @@
 }
 
 const std::string& DateTimeFormatter::GetFormattedValue() const {
   return formatted_string_;
 }
 
 const std::string DateTimeFormatter::FormatString() const {
   UErrorCode success = U_ZERO_ERROR;
   if (year_ == 0 && month_ == 0 && day_ == 0 &&
       hour_ == 0 && minute_ == 0 && second_ == 0) {
-    return "";
+    return std::string();
   }
 
   std::string result;
   const icu::GregorianCalendar calendar(
       year_, month_, day_, hour_, minute_, second_, success);
   if (success <= U_ZERO_ERROR) {
     UDate time = calendar.getTime(success);
     icu::SimpleDateFormat formatter(*pattern_, success);
     icu::UnicodeString formatted_time;
     formatter.format(time, formatted_time, success);
     UTF16ToUTF8(formatted_time.getBuffer(),
                 static_cast<size_t>(formatted_time.length()),
                 &result);
     if (success <= U_ZERO_ERROR)
       return result;
   }
   LOG(WARNING) << "Calendar not created: error " <<  success;
-  return "";
+  return std::string();
 }
 
 void DateTimeFormatter::ExtractType(
     const WebKit::WebDateTimeChooserParams& source) {
   switch (source.type) {
     case WebKit::WebDateTimeInputTypeDate:
       type_ = ui::TEXT_INPUT_TYPE_DATE;
       break;
     case WebKit::WebDateTimeInputTypeDateTime:
       type_ = ui::TEXT_INPUT_TYPE_DATE_TIME;
@@ skipping 58 matching lines @@
 void DateTimeFormatter::ClearAll() {
   year_ = 0;
   month_ = 0;
   day_ = 0;
   hour_ = 0;
   minute_ = 0;
   second_ = 0;
 }
 
 }  // namespace content