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

chrome/browser/metrics/metrics_service.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.
 
 //------------------------------------------------------------------------------
 // Description of the life cycle of a instance of MetricsService.
 //
 //  OVERVIEW
 //
 // A MetricsService instance is typically created at application startup.  It
@@ skipping 373 matching lines @@
  private:
   virtual ~MetricsMemoryDetails() {}
 
   base::Closure callback_;
   DISALLOW_COPY_AND_ASSIGN(MetricsMemoryDetails);
 };
 
 // static
 void MetricsService::RegisterPrefs(PrefRegistrySimple* registry) {
   DCHECK(IsSingleThreaded());
-  registry->RegisterStringPref(prefs::kMetricsClientID, "");
+  registry->RegisterStringPref(prefs::kMetricsClientID, std::string());
   registry->RegisterIntegerPref(prefs::kMetricsLowEntropySource,
                                 kLowEntropySourceNotSet);
   registry->RegisterInt64Pref(prefs::kMetricsClientIDTimestamp, 0);
   registry->RegisterInt64Pref(prefs::kStabilityLaunchTimeSec, 0);
   registry->RegisterInt64Pref(prefs::kStabilityLastTimestampSec, 0);
-  registry->RegisterStringPref(prefs::kStabilityStatsVersion, "");
+  registry->RegisterStringPref(prefs::kStabilityStatsVersion, std::string());
   registry->RegisterInt64Pref(prefs::kStabilityStatsBuildTime, 0);
   registry->RegisterBooleanPref(prefs::kStabilityExitedCleanly, true);
   registry->RegisterBooleanPref(prefs::kStabilitySessionEndCompleted, true);
   registry->RegisterIntegerPref(prefs::kMetricsSessionID, -1);
   registry->RegisterIntegerPref(prefs::kStabilityLaunchCount, 0);
   registry->RegisterIntegerPref(prefs::kStabilityCrashCount, 0);
   registry->RegisterIntegerPref(prefs::kStabilityIncompleteSessionEndCount, 0);
   registry->RegisterIntegerPref(prefs::kStabilityPageLoadCount, 0);
   registry->RegisterIntegerPref(prefs::kStabilityRendererCrashCount, 0);
   registry->RegisterIntegerPref(prefs::kStabilityExtensionRendererCrashCount,
@@ skipping 1459 matching lines @@
   if (local_state) {
     const PrefService::Preference* uma_pref =
         local_state->FindPreference(prefs::kMetricsReportingEnabled);
     if (uma_pref) {
       bool success = uma_pref->GetValue()->GetAsBoolean(&result);
       DCHECK(success);
     }
   }
   return result;
 }