Make the parser track the language mode instead of keeping its own harmony flag.

test/cctest/test-parsing.cc

Index: test/cctest/test-parsing.cc
diff --git a/test/cctest/test-parsing.cc b/test/cctest/test-parsing.cc
index c2bde79b13b28a4333c95f781b3eeb4fd27a5d6f..4029484111cda555762e61bdd6336d35f2a0f594 100755
--- a/test/cctest/test-parsing.cc
+++ b/test/cctest/test-parsing.cc
@@ -860,11 +860,13 @@ TEST(ScopePositions) {
     i::Handle<i::String> source(
         FACTORY->NewStringFromAscii(i::CStrVector(program.start())));
     i::Handle<i::Script> script = FACTORY->NewScript(source);
+    bool harmony_scoping = i::FLAG_harmony_scoping;
+    i::FLAG_harmony_scoping = true;
     i::Parser parser(script, false, NULL, NULL);
-    parser.SetHarmonyScoping(true);
     i::FunctionLiteral* function =
         parser.ParseProgram(source, true, source_data[i].language_mode);
-    ASSERT(function != NULL);
+    i::FLAG_harmony_scoping = harmony_scoping;
+    CHECK(function != NULL);
 
     // Check scope types and positions.
     i::Scope* scope = function->scope();