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

chrome/browser/metrics/metrics_service.cc

Index: chrome/browser/metrics/metrics_service.cc
diff --git a/chrome/browser/metrics/metrics_service.cc b/chrome/browser/metrics/metrics_service.cc
index e68d7bf0a107cc8bdcf740230a2199da1455f106..c25c8e624e2087253500dbbc59c3fee4553c7915 100644
--- a/chrome/browser/metrics/metrics_service.cc
+++ b/chrome/browser/metrics/metrics_service.cc
@@ -391,13 +391,13 @@ class MetricsMemoryDetails : public MemoryDetails {
 // 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);