Remove state variables in PumpSession as they are no longer used.

Remove state variables in PumpSession as they are no longer used.

This CL removes member variables of PumpSession, as they are no longer used.
Since r183572, all asynchronous parsing uses background thread and these
state variables were only used for deprecated asynchronous main thread parsing.

BUG=421189
Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=183728

[kouhei (in TOK), 2014-10-15 04:26:46]

kouhei@chromium.org changed reviewers:
+ eseidel@chromium.org, haraken@chromium.org, tasak@google.com

[kouhei (in TOK), 2014-10-15 04:26:47]

Refactoring. Dead code removals only.

[haraken, 2014-10-15 04:30:12]

LGTM

[tasak, 2014-10-15 05:19:58]

lgtm

[kouhei (in TOK), 2014-10-15 07:46:02]

The CQ bit was checked by kouhei@chromium.org

[commit-bot: I haz the power, 2014-10-15 07:47:10]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/657753002/20001

[commit-bot: I haz the power, 2014-10-15 08:49:51]

Committed patchset #2 (id:20001) as 183728