Allow std::unordered_*.

base/strings/string16_unittest.cc

Index: base/strings/string16_unittest.cc
diff --git a/base/strings/string16_unittest.cc b/base/strings/string16_unittest.cc
index 4e582181a863aa5114deb33ffc0e860b14f5385a..0d2ca808e92918fedff2d3243cc9e30ecbea0565 100644
--- a/base/strings/string16_unittest.cc
+++ b/base/strings/string16_unittest.cc
@@ -3,6 +3,7 @@
 // found in the LICENSE file.
 
 #include <sstream>
+#include <unordered_set>
 
 #include "base/strings/string16.h"
 
@@ -11,8 +12,6 @@
 
 namespace base {
 
-#if defined(WCHAR_T_IS_UTF32)
-
 // We define a custom operator<< for string16 so we can use it with logging.
 // This tests that conversion.
 TEST(String16Test, OutputStream) {
@@ -53,6 +52,15 @@ TEST(String16Test, OutputStream) {
   }
 }
 
-#endif
+TEST(String16Test, Hash) {
+  string16 str1 = ASCIIToUTF16("hello");
+  string16 str2 = ASCIIToUTF16("world");
+
+  std::unordered_set<string16> set;
+
+  set.insert(str1);
+  EXPECT_EQ(1u, set.count(str1));
+  EXPECT_EQ(0u, set.count(str2));
+}
 
 }  // namespace base