Remove unnecessary call to Isolate::Current in parser-shell

R=vogelheim@chromium.org
BUG=none
LOG=n

Review URL: https://codereview.chromium.org/1123203003

Cr-Commit-Position: refs/heads/master@{#28406}

tools/parser-shell.cc

@@ -93,7 +93,8 @@ std::pair<v8::base::TimeDelta, v8::base::TimeDelta> RunBaselineParser(
     }
   }
   v8::base::TimeDelta parse_time1, parse_time2;
-  Handle<Script> script = Isolate::Current()->factory()->NewScript(
+  Handle<Script> script =
+      reinterpret_cast<i::Isolate*>(isolate)->factory()->NewScript(
           v8::Utils::OpenHandle(*source_handle));
   i::ScriptData* cached_data_impl = NULL;
   // First round of parsing (produce data to cache).