Cleanup: Initialize Value from tools/gn by moving std::string

tools/clang/empty_string/tests/test-original.cc

Index: tools/clang/empty_string/tests/test-original.cc
diff --git a/tools/clang/empty_string/tests/test-original.cc b/tools/clang/empty_string/tests/test-original.cc
index 2edb896cc631665ed77a51e5a2c62c5644011986..2375e8972e4c680e8604254bf36a774ab2d0a149 100644
--- a/tools/clang/empty_string/tests/test-original.cc
+++ b/tools/clang/empty_string/tests/test-original.cc
@@ -32,14 +32,14 @@ class TestInitializers {
 
 // Tests for temporary std::strings.
 void TestTemporaries(const std::string& reference_argument,
-                     const std::string value_argument) {
+                     const std::string& value_argument) {
   TestTemporaries("", "");
   TestTemporaries(std::string(""), std::string(""));
 }
 
 // Tests for temporary std::wstrings.
 void TestWideTemporaries(const std::wstring& reference_argument,
-                         const std::wstring value_argument) {
+                         const std::wstring& value_argument) {
   TestWideTemporaries(L"", L"");
   TestWideTemporaries(std::wstring(L""), std::wstring(L""));
 }