Revert of Move ObjectContentType entirely to HTMLPlugInElement

Revert of Move ObjectContentType entirely to HTMLPlugInElement (patchset #2 id:20001 of https://codereview.chromium.org/2927703003/ )

Reason for revert:
Looks like schenney's unavailable at the moment; speculatively reverting for layout test virtual/new-remote-playback-pipeline/media/controls/controls-cast-overlay-slow-fade.html failures (e.g. https://build.chromium.org/p/chromium.linux/builders/Linux%20Tests/builds/57955)

Original issue's description:
> Move ObjectContentType entirely to HTMLPlugInElement
> 
> There's no need to go to LocalFrameClientImpl to determine how to load
> a plugin element, that was a purely pre-blink necessity.
> 
> Simplify a bunch of logic around HTMLPlugInElement to assume that url_
> and service_type_ are always set and correct by the time the
> ObjectContentType is being determined.
> 
> BUG=
> 
> Review-Url: https://codereview.chromium.org/2927703003
> Cr-Commit-Position: refs/heads/master@{#478683}
> Committed: https://chromium.googlesource.com/chromium/src/+/2718186cc8ac74b38b9a7304764642f05c76bb81

TBR=schenney@chromium.org,japhet@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=

Review-Url: https://codereview.chromium.org/2933213002
Cr-Commit-Position: refs/heads/master@{#478781}
Committed: https://chromium.googlesource.com/chromium/src/+/0c41b90c5acfe8b728cca4829ee0952015e0beca

[Devlin, 2017-06-12 21:53:25]

The CQ bit was checked by rdevlin.cronin@chromium.org

[Devlin, 2017-06-12 21:53:25]

Created Revert of Move ObjectContentType entirely to HTMLPlugInElement

[commit-bot: I haz the power, 2017-06-12 21:53:51]

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, 2017-06-12 21:54:14]

CQ is committing da patch.

Bot data: {"patchset_id": 1, "attempt_start_ts": 1497304405444950, "parent_rev":
"3043b941f5715ac0ec7d94f2f14d5d9ac9d32b1c", "commit_rev":
"0c41b90c5acfe8b728cca4829ee0952015e0beca"}

[commit-bot: I haz the power, 2017-06-12 21:54:25]

Description was changed from

==========
Revert of Move ObjectContentType entirely to HTMLPlugInElement (patchset #2
id:20001 of https://codereview.chromium.org/2927703003/ )

Reason for revert:
Looks like schenney's unavailable at the moment; speculatively reverting for
layout test
virtual/new-remote-playback-pipeline/media/controls/controls-cast-overlay-slow-fade.html
failures (e.g.
https://build.chromium.org/p/chromium.linux/builders/Linux%20Tests/builds/57955)

Original issue's description:
> Move ObjectContentType entirely to HTMLPlugInElement
> 
> There's no need to go to LocalFrameClientImpl to determine how to load
> a plugin element, that was a purely pre-blink necessity.
> 
> Simplify a bunch of logic around HTMLPlugInElement to assume that url_
> and service_type_ are always set and correct by the time the
> ObjectContentType is being determined.
> 
> BUG=
> 
> Review-Url: https://codereview.chromium.org/2927703003
> Cr-Commit-Position: refs/heads/master@{#478683}
> Committed:
https://chromium.googlesource.com/chromium/src/+/2718186cc8ac74b38b9a73047646...

TBR=schenney@chromium.org,japhet@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=
==========

to

==========
Revert of Move ObjectContentType entirely to HTMLPlugInElement (patchset #2
id:20001 of https://codereview.chromium.org/2927703003/ )

Reason for revert:
Looks like schenney's unavailable at the moment; speculatively reverting for
layout test
virtual/new-remote-playback-pipeline/media/controls/controls-cast-overlay-slow-fade.html
failures (e.g.
https://build.chromium.org/p/chromium.linux/builders/Linux%20Tests/builds/57955)

Original issue's description:
> Move ObjectContentType entirely to HTMLPlugInElement
> 
> There's no need to go to LocalFrameClientImpl to determine how to load
> a plugin element, that was a purely pre-blink necessity.
> 
> Simplify a bunch of logic around HTMLPlugInElement to assume that url_
> and service_type_ are always set and correct by the time the
> ObjectContentType is being determined.
> 
> BUG=
> 
> Review-Url: https://codereview.chromium.org/2927703003
> Cr-Commit-Position: refs/heads/master@{#478683}
> Committed:
https://chromium.googlesource.com/chromium/src/+/2718186cc8ac74b38b9a73047646...

TBR=schenney@chromium.org,japhet@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=

Review-Url: https://codereview.chromium.org/2933213002
Cr-Commit-Position: refs/heads/master@{#478781}
Committed:
https://chromium.googlesource.com/chromium/src/+/0c41b90c5acfe8b728cca4829ee0...
==========

[commit-bot: I haz the power, 2017-06-12 21:54:26]

Committed patchset #1 (id:1) as
https://chromium.googlesource.com/chromium/src/+/0c41b90c5acfe8b728cca4829ee0...