[resize-observer] Remove HTML monkey patch.

This is now upstream.

Fixes w3c#4824

Author: emilio

resize-observer-1/Overview.bs

@@ -26,9 +26,6 @@ urlPrefix: https://drafts.csswg.org/css-box-3/
     url: #padding-physical; type: dfn; text: padding left
 urlPrefix: https://www.w3.org/TR/css3-positioning/
     url: #viewport; type: dfn; text: viewport
-urlPrefix: https://html.spec.whatwg.org/multipage/
-    urlPrefix: webappapis.html;
-        url: #processing-model-8; type: dfn; text: HTML Processing Model
 urlPrefix: https://www.w3.org/TR/intersection-observer/
     url: #intersection-observer-interface; type: interface; text: IntersectionObserver
 urlPrefix: https://www.w3.org/TR/SVG2/
@@ -589,64 +586,3 @@ A {{ResizeObserver}} will remain alive until both of these conditions are met:
 * there are no scripting references to the observer.
 
 * the observer is not observing any targets.
-
-<h3 id="integrations">External Spec Integrations</h3>
-
-<h4 id="html-event-loop"> HTML Processing Model: Event Loop</h4>
-
-{{ResizeObserver}} processing happens inside the step 7.16 of the <a>HTML Processing Model</a> event loop.
-
-Step 16 is currently underspecified as:
-
-<q>For each fully active Document in docs, update the rendering or user interface of that Document and its browsing context to reflect the current state.</q>.
-
-Existing step 16 can be fully specified as:
-
-For each fully active Document in docs, run the following steps for that Document and its browsing contents:
-
-    1. Recalc styles
-
-    2. Update layout
-
-    3. Paint
-
-{{ResizeObserver}} extends step 16 with resize notifications.
-It tries to deliver all pending notifications by looping
-until no pending notifications are available. This can cause
-an infinite loop.
-
-Infinite loop is prevented by shrinking the set of
-nodes that can notify at every iteration. In each iteration,
-only nodes deeper than the shallowest node in previous iteration
-can notify.
-
-An error is generated if notification loop completes, and there
-are undelivered notifications. Elements with undelivered notifications
-will be considered for delivery in the next loop.
-
-
-Step 16 with {{ResizeObserver}} notifications is:
-
-For each fully active Document in docs, run the following steps for that Document and its browsing context:
-
-1. Recalc styles
-
-2. Update layout
-
-3. Set |depth| to 0
-
-4. <a>Gather active resize observations at depth</a> |depth| for {{Document}}
-
-5. Repeat while document <a>has active resize observations</a>
-
-    2. Set |depth| to <a>broadcast active resize observations</a>.
-
-    3. Recalc styles
-
-    4. Update layout
-
-    5. <a>Gather active resize observations at depth</a> |depth| for {{Document}}
-
-6. If {{Document}} <a>has skipped resize observations</a> then <a>deliver resize loop error notification</a>
-
-7. Update the rendering or user interface of {{Document}} and its browsing context to reflect the current state.