Remove unused method in html_document

Remove unused method in html_document

Blink has been updated long time ago to use the new
createMediaPlayer method, so removing this unused old method.

TEST=compiles
BUG=350571
Committed: https://crrev.com/dca49897b2a0938dab1811f1072a1196bbba2854
Cr-Commit-Position: refs/heads/master@{#332033}

[Srirama, 2015-05-29 16:40:44]

srirama.m@samsung.com changed reviewers:
+ ddorwin@chromium.org, jrummell@chromium.org, philipj@opera.com

[Srirama, 2015-05-29 16:40:45]

This is required for landing https://codereview.chromium.org/1125353004/.
PTAL

[philipj_slow, 2015-05-29 16:46:10]

Non-owner LGTM

[Srirama, 2015-05-29 16:57:40]

srirama.m@samsung.com changed reviewers:
+ brettw@chromium.org

[Srirama, 2015-05-29 16:57:40]

brettw@chromium.org: Owners review please.

[brettw, 2015-05-29 17:18:31]

I don't know anything about this component, removing myself. Generally you
should pick owners as close to the component in question as possible.

[jrummell, 2015-05-29 17:43:13]

lgtm

[philipj_slow, 2015-05-29 17:44:17]

The CQ bit was checked by philipj@opera.com

[commit-bot: I haz the power, 2015-05-29 17:45:29]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1161773003/1

[commit-bot: I haz the power, 2015-05-29 17:56:09]

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

[commit-bot: I haz the power, 2015-05-29 17:56:10]

Try jobs failed on following builders:
  chromium_presubmit on tryserver.chromium.linux (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.linux/builders/chromium_presub...)

[Srirama, 2015-05-29 18:54:53]

srirama.m@samsung.com changed reviewers:
+ sky@chromium.org
- brettw@chromium.org

[Srirama, 2015-05-29 18:54:54]

sky@:Owner's review please.

[sky, 2015-05-29 19:16:19]

LGTM

[Srirama, 2015-05-29 20:01:52]

The CQ bit was checked by srirama.m@samsung.com

[commit-bot: I haz the power, 2015-05-29 20:03:52]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1161773003/1

[commit-bot: I haz the power, 2015-05-29 20:10:18]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-05-29 20:11:20]

Patchset 1 (id:??) landed as
https://crrev.com/dca49897b2a0938dab1811f1072a1196bbba2854
Cr-Commit-Position: refs/heads/master@{#332033}