Revert of HTMLParser should use current value of scriptEnabled flag

Revert of HTMLParser should use current value of scriptEnabled flag (https://codereview.chromium.org/313173012/)

Reason for revert:
This patch *appears* to break AwSettingsTest and
AwContentsClientShouldOverrideUrlLoadingTest:
http://build.chromium.org/p/chromium.webkit/builders/Android%20Tests%20(dbg)

This is my wild guess but it might be possible
that this patch is the cause, since the tests in
question call setJavaScriptEnabled(true).

Apologies if my guess is wrong. I'll revert the
revert if it turned out that I'm wrong.

Original issue's description:
> HTMLParser should use current value of scriptEnabled flag
> 
> This CL adds caching  of scriptEnabled setting to Document.
> 
> When page is reloaded we create new parser throught DocumentLoader::ensureWriter
> and set scriptEnabled flag. ContentSettingsObserver::allowScript method is
> responsible for checking settings but it uses cache. Cache is cleared on
> DidCommitProvisionalLoad but parser is already created before that. However we
> can't clear cache earlier because unload events for old page might be fired and
> it depends on old page settings (cached).
> 
> BUG=232410
> 
> Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=177664

NOTREECHECKS=true
NOTRY=true
BUG=232410
Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=177730

[Yuta Kitamura, 2014-07-09 09:20:44]

Created Revert of HTMLParser should use current value of scriptEnabled flag

[commit-bot: I haz the power, 2014-07-09 09:21:31]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/yutak@chromium.org/375263002/1

[commit-bot: I haz the power, 2014-07-09 09:21:32]

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

[commit-bot: I haz the power, 2014-07-09 09:21:33]

No LGTM from a valid reviewer yet. Only full committers are accepted.
Even if an LGTM may have been provided, it was from a non-committer or
a provisional committer, _not_ a full super star committer.
See http://www.chromium.org/getting-involved/become-a-committer
Note that this has nothing to do with OWNERS files.

[haraken, 2014-07-09 09:25:03]

LGTM

[haraken, 2014-07-09 09:25:08]

The CQ bit was checked by haraken@chromium.org

[commit-bot: I haz the power, 2014-07-09 09:25:32]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/yutak@chromium.org/375263002/1

[Yuta Kitamura, 2014-07-09 09:30:12]

It's weird the revert did not add TBR or NOTREECHECKS lines
to the change description.

I'll cancel current CQ and try again after I added these.

[Yuta Kitamura, 2014-07-09 09:30:16]

The CQ bit was unchecked by yutak@chromium.org

[Yuta Kitamura, 2014-07-09 09:30:41]

The CQ bit was checked by yutak@chromium.org

[commit-bot: I haz the power, 2014-07-09 09:31:34]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/yutak@chromium.org/375263002/1

[commit-bot: I haz the power, 2014-07-09 09:32:07]

Change committed as 177730