Rename ascii to one-byte where applicable.

src/serialize.h

Index: src/serialize.h
diff --git a/src/serialize.h b/src/serialize.h
index e4e6c3ad86b4430cf0e47b9e375387efbf4e1ea3..066d75fb0b38bb34c76e232d17edc8f77b43bafe 100644
--- a/src/serialize.h
+++ b/src/serialize.h
@@ -430,8 +430,8 @@ class Serializer : public SerializerDeserializer {
     void VisitCell(RelocInfo* rinfo);
     void VisitRuntimeEntry(RelocInfo* reloc);
     // Used for seralizing the external strings that hold the natives source.
-    void VisitExternalAsciiString(
-        v8::String::ExternalAsciiStringResource** resource);
+    void VisitExternalOneByteString(
+        v8::String::ExternalOneByteStringResource** resource);
     // We can't serialize a heap with external two byte strings.
     void VisitExternalTwoByteString(
         v8::String::ExternalStringResource** resource) {