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

chrome/browser/metrics/metrics_log.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 "chrome/browser/metrics/metrics_log.h"
 
 #include <algorithm>
 #include <string>
 #include <vector>
 
@@ skipping 951 matching lines @@
     }
   }
 }
 
 void MetricsLog::RecordOmniboxOpenedURL(const AutocompleteLog& log) {
   DCHECK(!locked());
 
   // Write the XML version.
   OPEN_ELEMENT_FOR_SCOPE("uielement");
   WriteAttribute("action", "autocomplete");
-  WriteAttribute("targetidhash", "");
+  WriteAttribute("targetidhash", std::string());
   // TODO(kochi): Properly track windows.
   WriteIntAttribute("window", 0);
   if (log.tab_id != -1) {
     // If we know what tab the autocomplete URL was opened in, log it.
     WriteIntAttribute("tab", static_cast<int>(log.tab_id));
   }
   WriteCommonEventAttributes();
 
   std::vector<string16> terms;
   const int num_terms =
@@ skipping 97 matching lines @@
     ProductDataToProto(google_update_metrics.google_update_data,
                        google_update->mutable_google_update_status());
   }
 
   if (!google_update_metrics.product_data.version.empty()) {
     ProductDataToProto(google_update_metrics.product_data,
                        google_update->mutable_client_status());
   }
 #endif  // defined(GOOGLE_CHROME_BUILD) && defined(OS_WIN)
 }