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

base/file_util_posix.cc

Index: base/file_util_posix.cc
diff --git a/base/file_util_posix.cc b/base/file_util_posix.cc
index fa2c1ffe35456485225b0449459334565e14dc7a..1512c0f04795a8bd70ed4763e9a46be765f0b385 100644
--- a/base/file_util_posix.cc
+++ b/base/file_util_posix.cc
@@ -541,7 +541,8 @@ bool CreateDirectory(const FilePath& full_path) {
 base::FilePath MakeUniqueDirectory(const base::FilePath& path) {
   const int kMaxAttempts = 20;
   for (int attempts = 0; attempts < kMaxAttempts; attempts++) {
-    int uniquifier = GetUniquePathNumber(path, FILE_PATH_LITERAL(""));
+    int uniquifier =
+        GetUniquePathNumber(path, FILE_PATH_LITERAL(std::string()));
     if (uniquifier < 0)
       break;
     base::FilePath test_path = (uniquifier == 0) ? path :