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

chrome/common/extensions/features/simple_feature.cc

Index: chrome/common/extensions/features/simple_feature.cc
diff --git a/chrome/common/extensions/features/simple_feature.cc b/chrome/common/extensions/features/simple_feature.cc
index 13c8573edcdf94ee6c4aaa81db74d4b1cd18306d..4b08c6020d2f60596d3fca102b0b51bef2aff86e 100644
--- a/chrome/common/extensions/features/simple_feature.cc
+++ b/chrome/common/extensions/features/simple_feature.cc
@@ -168,7 +168,7 @@ std::string GetDisplayTypeName(Manifest::Type type) {
   }
 
   NOTREACHED();
-  return "";
+  return std::string();
 }
 
 }  // namespace
@@ -229,7 +229,7 @@ std::string SimpleFeature::Parse(const DictionaryValue* value) {
     return name() + ": Allowing web_page contexts requires supplying a value " +
         "for matches.";
   }
-  return "";
+  return std::string();
 }
 
 Feature::Availability SimpleFeature::IsAvailableToManifest(
@@ -313,7 +313,7 @@ std::string SimpleFeature::GetAvailabilityMessage(
     AvailabilityResult result, Manifest::Type type, const GURL& url) const {
   switch (result) {
     case IS_AVAILABLE:
-      return "";
+      return std::string();
     case NOT_FOUND_IN_WHITELIST:
       return base::StringPrintf(
           "'%s' is not allowed for specified extension ID.",
@@ -381,7 +381,7 @@ std::string SimpleFeature::GetAvailabilityMessage(
   }
 
   NOTREACHED();
-  return "";
+  return std::string();
 }
 
 Feature::Availability SimpleFeature::CreateAvailability(