Remove deprecated "i::" prefix from the preparser.

src/preparser.h

Index: src/preparser.h
diff --git a/src/preparser.h b/src/preparser.h
index 5cb453527e028f4944f2272c6c3e115a584de6d7..e99b4b0a181e200030100aa10446cfa2cb7bf923 100644
--- a/src/preparser.h
+++ b/src/preparser.h
@@ -218,10 +218,6 @@ class ParserBase {
 // rather it is to speed up properly written and correct programs.
 // That means that contextual checks (like a label being declared where
 // it is used) are generally omitted.
-
-typedef uint8_t byte;
-namespace i = v8::internal;
-
 class PreParser : public ParserBase {
  public:
   enum PreParseResult {