Rename base/hash_tables to base/containers/hash_tables.

base/strings/string_piece.h

Index: base/strings/string_piece.h
diff --git a/base/strings/string_piece.h b/base/strings/string_piece.h
index a433a4444d1d4e044be4d5d75f3f60cd22f35632..818d6ca598b11fcfaf467b53b95063e7ae66098a 100644
--- a/base/strings/string_piece.h
+++ b/base/strings/string_piece.h
@@ -30,7 +30,7 @@
 
 #include "base/base_export.h"
 #include "base/basictypes.h"
-#include "base/hash_tables.h"
+#include "base/containers/hash_tables.h"
 #include "base/strings/string16.h"
 
 namespace base {
@@ -409,9 +409,9 @@ BASE_EXPORT std::ostream& operator<<(std::ostream& o,
 // We provide appropriate hash functions so StringPiece and StringPiece16 can
 // be used as keys in hash sets and maps.
 
-// This hash function is copied from base/hash_tables.h. We don't use the
-// ones already defined for string and string16 directly because it would
-// require the string constructors to be called, which we don't want.
+// This hash function is copied from base/containers/hash_tables.h. We don't
+// use the ones already defined for string and string16 directly because it
+// would require the string constructors to be called, which we don't want.
 #define HASH_STRING_PIECE(StringPieceType, string_piece)                \
   std::size_t result = 0;                                               \
   for (StringPieceType::const_iterator i = string_piece.begin();        \