Revert of Tracking filter mutation via SVGElementProxy

Revert of Tracking filter mutation via SVGElementProxy (patchset #15 id:280001 of https://codereview.chromium.org/2401343002/ )

Reason for revert:
There are several reports of issues from this patch. Lets go ahead and roll out for now.

BUG=663362, 663444, 663473, 663362
Original issue's description:
> Tracking reference filter mutation via SVGElementProxy
>
> This introduces SVGElementProxy - a new piece with the functionality of
> DocumentResourceReference and the ReferenceFilterBuilder merged. It
> provides the means to track clients of a certain element (only
> SVGFilterElements for now, but will likely be extended to other types if
> it ends up sticking.) An SVGElementProxy is created, and primarily owned,
> by CSSURIValue. The proxy also handles loading of a resource document, if
> requested.
>
> Clients are SVGResourceClients, like before, with methods/callbacks
> renamed. Some of the old functionality of SVGResourceClient has either
> been moved to clients, to the proxy or been replaced with different
> solutions.
>
> Mutations to the element/subtree is signaled separately from any
> potential changes to the actual reference (anything that might invalidate
> the element reference.)
>
> BUG=439970
> CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.linux:linux_layout_tests_slimming_paint_v2
>
> Committed: https://crrev.com/d36f8a8c9c4b7d757c0d8832e624be80c4465991
> Cr-Commit-Position: refs/heads/master@{#430550}

TBR=esprehn@chromium.org,fs@opera.com
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true

BUG=439970, 663362, 663444, 663473, 663362
Committed: https://crrev.com/11759c7f36706a115c03b9fc98a6060dd73a71e9
Cr-Commit-Position: refs/heads/master@{#430800}

[pdr., 2016-11-09 00:47:08]

Created Revert of Tracking filter mutation via SVGElementProxy

[esprehn, 2016-11-09 00:47:41]

lgtm

[pdr., 2016-11-09 00:47:57]

Description was changed from

==========
Revert of Tracking filter mutation via SVGElementProxy (patchset #15 id:280001
of https://codereview.chromium.org/2401343002/ )

Reason for revert:
There are several reports of issues from this patch. Lets go ahead and roll out
for now.

BUG=663362,663444,663473,663362

Original issue's description:
> Tracking reference filter mutation via SVGElementProxy
> 
> This introduces SVGElementProxy - a new piece with the functionality of
> DocumentResourceReference and the ReferenceFilterBuilder merged. It
> provides the means to track clients of a certain element (only
> SVGFilterElements for now, but will likely be extended to other types if
> it ends up sticking.) An SVGElementProxy is created, and primarily owned,
> by CSSURIValue. The proxy also handles loading of a resource document, if
> requested.
> 
> Clients are SVGResourceClients, like before, with methods/callbacks
> renamed. Some of the old functionality of SVGResourceClient has either
> been moved to clients, to the proxy or been replaced with different
> solutions.
> 
> Mutations to the element/subtree is signaled separately from any
> potential changes to the actual reference (anything that might invalidate
> the element reference.)
> 
> BUG=439970
>
CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.linux:linux_layout_tests_slimming_paint_v2
> 
> Committed: https://crrev.com/d36f8a8c9c4b7d757c0d8832e624be80c4465991
> Cr-Commit-Position: refs/heads/master@{#430550}

TBR=esprehn@chromium.org,fs@opera.com
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=439970
==========

to

==========
Revert of Tracking filter mutation via SVGElementProxy (patchset #15 id:280001
of https://codereview.chromium.org/2401343002/ )

Reason for revert:
There are several reports of issues from this patch. Lets go ahead and roll out
for now.

BUG=663362,663444,663473,663362

Original issue's description:
> Tracking reference filter mutation via SVGElementProxy
> 
> This introduces SVGElementProxy - a new piece with the functionality of
> DocumentResourceReference and the ReferenceFilterBuilder merged. It
> provides the means to track clients of a certain element (only
> SVGFilterElements for now, but will likely be extended to other types if
> it ends up sticking.) An SVGElementProxy is created, and primarily owned,
> by CSSURIValue. The proxy also handles loading of a resource document, if
> requested.
> 
> Clients are SVGResourceClients, like before, with methods/callbacks
> renamed. Some of the old functionality of SVGResourceClient has either
> been moved to clients, to the proxy or been replaced with different
> solutions.
> 
> Mutations to the element/subtree is signaled separately from any
> potential changes to the actual reference (anything that might invalidate
> the element reference.)
> 
> BUG=439970
>
CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.linux:linux_layout_tests_slimming_paint_v2
> 
> Committed: https://crrev.com/d36f8a8c9c4b7d757c0d8832e624be80c4465991
> Cr-Commit-Position: refs/heads/master@{#430550}

TBR=esprehn@chromium.org,fs@opera.com
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true

BUG=439970,663362,663444,663473,663362
==========

[pdr., 2016-11-09 00:48:12]

The CQ bit was checked by pdr@chromium.org

[commit-bot: I haz the power, 2016-11-09 00:48:54]

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, 2016-11-09 00:50:51]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-11-09 00:57:18]

Description was changed from

==========
Revert of Tracking filter mutation via SVGElementProxy (patchset #15 id:280001
of https://codereview.chromium.org/2401343002/ )

Reason for revert:
There are several reports of issues from this patch. Lets go ahead and roll out
for now.

BUG=663362,663444,663473,663362

Original issue's description:
> Tracking reference filter mutation via SVGElementProxy
> 
> This introduces SVGElementProxy - a new piece with the functionality of
> DocumentResourceReference and the ReferenceFilterBuilder merged. It
> provides the means to track clients of a certain element (only
> SVGFilterElements for now, but will likely be extended to other types if
> it ends up sticking.) An SVGElementProxy is created, and primarily owned,
> by CSSURIValue. The proxy also handles loading of a resource document, if
> requested.
> 
> Clients are SVGResourceClients, like before, with methods/callbacks
> renamed. Some of the old functionality of SVGResourceClient has either
> been moved to clients, to the proxy or been replaced with different
> solutions.
> 
> Mutations to the element/subtree is signaled separately from any
> potential changes to the actual reference (anything that might invalidate
> the element reference.)
> 
> BUG=439970
>
CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.linux:linux_layout_tests_slimming_paint_v2
> 
> Committed: https://crrev.com/d36f8a8c9c4b7d757c0d8832e624be80c4465991
> Cr-Commit-Position: refs/heads/master@{#430550}

TBR=esprehn@chromium.org,fs@opera.com
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true

BUG=439970,663362,663444,663473,663362
==========

to

==========
Revert of Tracking filter mutation via SVGElementProxy (patchset #15 id:280001
of https://codereview.chromium.org/2401343002/ )

Reason for revert:
There are several reports of issues from this patch. Lets go ahead and roll out
for now.

BUG=663362,663444,663473,663362

Original issue's description:
> Tracking reference filter mutation via SVGElementProxy
>
> This introduces SVGElementProxy - a new piece with the functionality of
> DocumentResourceReference and the ReferenceFilterBuilder merged. It
> provides the means to track clients of a certain element (only
> SVGFilterElements for now, but will likely be extended to other types if
> it ends up sticking.) An SVGElementProxy is created, and primarily owned,
> by CSSURIValue. The proxy also handles loading of a resource document, if
> requested.
>
> Clients are SVGResourceClients, like before, with methods/callbacks
> renamed. Some of the old functionality of SVGResourceClient has either
> been moved to clients, to the proxy or been replaced with different
> solutions.
>
> Mutations to the element/subtree is signaled separately from any
> potential changes to the actual reference (anything that might invalidate
> the element reference.)
>
> BUG=439970
>
CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.linux:linux_layout_tests_slimming_paint_v2
>
> Committed: https://crrev.com/d36f8a8c9c4b7d757c0d8832e624be80c4465991
> Cr-Commit-Position: refs/heads/master@{#430550}

TBR=esprehn@chromium.org,fs@opera.com
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true

BUG=439970,663362,663444,663473,663362

Committed: https://crrev.com/11759c7f36706a115c03b9fc98a6060dd73a71e9
Cr-Commit-Position: refs/heads/master@{#430800}
==========

[commit-bot: I haz the power, 2016-11-09 00:57:20]

Patchset 1 (id:??) landed as
https://crrev.com/11759c7f36706a115c03b9fc98a6060dd73a71e9
Cr-Commit-Position: refs/heads/master@{#430800}