Don't use identity as hash function for integers.

test/unittests/base/functional-unittest.cc

Index: test/unittests/base/functional-unittest.cc
diff --git a/test/unittests/base/functional-unittest.cc b/test/unittests/base/functional-unittest.cc
index e6f260f2b8da68d2f9cb10b71f958641f9c4628c..4015485a88d1d0dfb38ca50a424f09c0b4af69a7 100644
--- a/test/unittests/base/functional-unittest.cc
+++ b/test/unittests/base/functional-unittest.cc
@@ -83,7 +83,7 @@ TYPED_TEST(FunctionalTest, HashIsStateless) {
 
 TYPED_TEST(FunctionalTest, HashIsOkish) {
   const size_t kValues = 128;
-  const size_t kMinHashes = kValues / (sizeof(uint64_t) / sizeof(size_t));
+  const size_t kMinHashes = kValues / 4;
   std::set<TypeParam> vs;
   while (vs.size() != kValues) {
     TypeParam v;