Revert of Allow std::unordered_*.

cc/quads/render_pass_id.cc

Index: cc/quads/render_pass_id.cc
diff --git a/cc/quads/render_pass_id.cc b/cc/quads/render_pass_id.cc
index 742c191f5b49194dacd535fdd40a94a363d58dd0..0f53e81dbc558e47401c84aaef997c97432d08b5 100644
--- a/cc/quads/render_pass_id.cc
+++ b/cc/quads/render_pass_id.cc
@@ -2,11 +2,9 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#include "cc/quads/render_pass_id.h"
-
 #include <stddef.h>
 
-#include "base/hash.h"
+#include "cc/quads/render_pass_id.h"
 
 namespace cc {
 
@@ -14,7 +12,7 @@
   static_assert(sizeof(size_t) <= sizeof(void*),  // NOLINT
                 "size of size_t should not be greater than that of a pointer");
   return reinterpret_cast<void*>(
-      base::HashInts(layer_id, static_cast<int>(index)));
+      base::HashPair(layer_id, static_cast<int>(index)));
 }
 
 }  // namespace cc