Use StrictModeFlag in preparser and preparse data.

src/preparse-data.h

Index: src/preparse-data.h
diff --git a/src/preparse-data.h b/src/preparse-data.h
index c6503c4fc1642aec6540bef36192169cd8901585..c4ddecdb6ff37bab69cdecdfabc3f0ed3a4b259e 100644
--- a/src/preparse-data.h
+++ b/src/preparse-data.h
@@ -49,7 +49,7 @@ class ParserRecorder {
                            int end,
                            int literals,
                            int properties,
-                           int strict_mode) = 0;
+                           StrictModeFlag strict_mode) = 0;
 
   // Logs a symbol creation of a literal or identifier.
   virtual void LogAsciiSymbol(int start, Vector<const char> literal) { }
@@ -89,7 +89,7 @@ class FunctionLoggingParserRecorder : public ParserRecorder {
                            int end,
                            int literals,
                            int properties,
-                           int strict_mode) {
+                           StrictModeFlag strict_mode) {
     function_store_.Add(start);
     function_store_.Add(end);
     function_store_.Add(literals);