Refactoring: Move StyledMarkupSerializer::m_reversedPrecedingMarkup to StyledMarkupAccumulator

Refactoring: Move StyledMarkupSerializer::m_reversedPrecedingMarkup to StyledMarkupAccumulator

This CL moves StyledMarkupSerializer::m_reversedPrecedingMarkup to
StyledMarkupAccumulator because

1. StyleMarkupSerializer is a template class but the functions I
moved don't use the template parameter, so moving them to a
non-template class will improve code health.
2. We can make some functions in StyledMarkupAccumulator private.
We have no plan to use these methods externally so far and this is
also good for code health.

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

Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=196399

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

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

[hajimehoshi, 2015-06-03 06:49:56]

PTAL

[yosin_UTC9, 2015-06-03 07:19:55]

lgtm

[yosin_UTC9, 2015-06-03 07:20:00]

The CQ bit was checked by yosin@chromium.org

[commit-bot: I haz the power, 2015-06-03 07:20:48]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1165833002/20001

[commit-bot: I haz the power, 2015-06-03 11:00:52]

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

[commit-bot: I haz the power, 2015-06-03 11:00:53]

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/64968)

[hajimehoshi, 2015-06-03 11:02:46]

The CQ bit was checked by hajimehoshi@chromium.org

[hajimehoshi, 2015-06-03 11:02:59]

The CQ bit was unchecked by hajimehoshi@chromium.org

[hajimehoshi, 2015-06-03 11:16:53]

The CQ bit was checked by hajimehoshi@chromium.org

[hajimehoshi, 2015-06-03 11:16:53]

The patchset sent to the CQ was uploaded after l-g-t-m from yosin@chromium.org
Link to the patchset: https://codereview.chromium.org/1165833002/#ps40001
(title: "rebase")

[commit-bot: I haz the power, 2015-06-03 11:17:42]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1165833002/40001

[commit-bot: I haz the power, 2015-06-03 13:43:13]

Committed patchset #3 (id:40001) as
https://src.chromium.org/viewvc/blink?view=rev&revision=196399