Allow std::unordered_*.

base/location.h

Index: base/location.h
diff --git a/base/location.h b/base/location.h
index d3bb23c63ea45176cfa3a8cb3b38ce417adc43f4..21e270c5a9fc5b5e8f6716651151d4fa14eb54b9 100644
--- a/base/location.h
+++ b/base/location.h
@@ -11,7 +11,7 @@
 #include <string>
 
 #include "base/base_export.h"
-#include "base/containers/hash_tables.h"
+#include "base/hash.h"
 
 namespace tracked_objects {
 
@@ -59,7 +59,7 @@ class BASE_EXPORT Location {
       // it comes from __FILE__, so no need to check the contents of the string.
       // See the definition of FROM_HERE in location.h, and how it is used
       // elsewhere.
-      return base::HashPair(reinterpret_cast<uintptr_t>(location.file_name()),
+      return base::HashInts(reinterpret_cast<uintptr_t>(location.file_name()),
                             location.line_number());
     }
   };