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

chrome/browser/storage_monitor/media_storage_util.cc

Index: chrome/browser/storage_monitor/media_storage_util.cc
diff --git a/chrome/browser/storage_monitor/media_storage_util.cc b/chrome/browser/storage_monitor/media_storage_util.cc
index 72602fa3f343fda81ceca752ebd68a41a52e12d5..dc9c61b545d9e7e79e742e899f22e36c123dc030 100644
--- a/chrome/browser/storage_monitor/media_storage_util.cc
+++ b/chrome/browser/storage_monitor/media_storage_util.cc
@@ -187,8 +187,9 @@ std::string MediaStorageUtil::MakeDeviceId(Type type,
 bool MediaStorageUtil::CrackDeviceId(const std::string& device_id,
                                      Type* type, std::string* unique_id) {
   size_t prefix_length = device_id.find_first_of(':');
-  std::string prefix = prefix_length != std::string::npos ?
-                       device_id.substr(0, prefix_length + 1) : "";
+  std::string prefix = prefix_length != std::string::npos
+                           ? device_id.substr(0, prefix_length + 1)
+                           : std::string();
 
   Type found_type;
   if (prefix == kRemovableMassStorageWithDCIMPrefix) {