Rename SeqAsciiString

src/heap.h

Index: src/heap.h
diff --git a/src/heap.h b/src/heap.h
index 3a37accc03f6f6b6ae4367379bd4c77e407784b3..c6b3794404fb99c9487c2fcd9cece749acb0c772 100644
--- a/src/heap.h
+++ b/src/heap.h
@@ -1045,9 +1045,8 @@ class Heap {
     return LookupSymbol(CStrVector(str));
   }
   MUST_USE_RESULT MaybeObject* LookupSymbol(String* str);
-  MUST_USE_RESULT MaybeObject* LookupAsciiSymbol(Handle<SeqAsciiString> string,
-                                                 int from,
-                                                 int length);
+  MUST_USE_RESULT MaybeObject* LookupAsciiSymbol(
+      Handle<SeqOneByteString> string, int from, int length);
 
   bool LookupSymbolIfExists(String* str, String** symbol);
   bool LookupTwoCharsSymbolIfExists(String* str, String** symbol);