Refactoring: Use enum class for SerializationType

Refactoring: Use enum class for SerializationType

BUG=n/a
TEST=n/a; no behavior change

Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=196302

[hajimehoshi, 2015-06-02 03:55:49]

hajimehoshi@chromium.org changed reviewers:
+ tkent@chromium.org, yosin@chromium.org

[hajimehoshi, 2015-06-02 03:55:50]

PTAL

[tkent, 2015-06-02 04:46:13]

The CQ bit was checked by tkent@chromium.org

[tkent, 2015-06-02 04:46:14]

lgtm

[commit-bot: I haz the power, 2015-06-02 04:47:00]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1157363007/1

[commit-bot: I haz the power, 2015-06-02 06:47:52]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2015-06-02 06:47:53]

Try jobs failed on following builders:
  win_blink_rel on tryserver.blink (JOB_FAILED,
http://build.chromium.org/p/tryserver.blink/builders/win_blink_rel/builds/64725)

[hajimehoshi, 2015-06-02 08:11:05]

The CQ bit was checked by hajimehoshi@chromium.org

[commit-bot: I haz the power, 2015-06-02 08:11:32]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1157363007/1

[commit-bot: I haz the power, 2015-06-02 09:43:22]

Committed patchset #1 (id:1) as
https://src.chromium.org/viewvc/blink?view=rev&revision=196302