Removed unused StyleEngine::didRemoveShadowRoot().

Removed unused StyleEngine::didRemoveShadowRoot().

Also tried to figure out and document why we are clearing
ScopedStyleResolvers for shadow trees in clearResolver().

R=meade@chromium.org

Committed: https://crrev.com/add89dccfa58602f8875c289a935e5cccd3f353c
Cr-Commit-Position: refs/heads/master@{#427950}

[rune, 2016-10-26 23:59:01]

The CQ bit was checked by rune@opera.com to run a CQ dry run

[rune, 2016-10-26 23:59:09]

ptal

[commit-bot: I haz the power, 2016-10-26 23:59:27]

Dry run: CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[commit-bot: I haz the power, 2016-10-27 01:23:32]

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

[commit-bot: I haz the power, 2016-10-27 01:23:33]

Dry run: This issue passed the CQ dry run.

[meade_UTC10, 2016-10-27 01:42:24]

lgtm

[rune, 2016-10-27 05:54:10]

The CQ bit was checked by rune@opera.com

[commit-bot: I haz the power, 2016-10-27 05:54:32]

CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[commit-bot: I haz the power, 2016-10-27 05:58:45]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-10-27 06:00:16]

Description was changed from

==========
Removed unused StyleEngine::didRemoveShadowRoot().

Also tried to figure out and document why we are clearing
ScopedStyleResolvers for shadow trees in clearResolver().

R=meade@chromium.org
==========

to

==========
Removed unused StyleEngine::didRemoveShadowRoot().

Also tried to figure out and document why we are clearing
ScopedStyleResolvers for shadow trees in clearResolver().

R=meade@chromium.org

Committed: https://crrev.com/add89dccfa58602f8875c289a935e5cccd3f353c
Cr-Commit-Position: refs/heads/master@{#427950}
==========

[commit-bot: I haz the power, 2016-10-27 06:00:17]

Patchset 1 (id:??) landed as
https://crrev.com/add89dccfa58602f8875c289a935e5cccd3f353c
Cr-Commit-Position: refs/heads/master@{#427950}