[cssom-view] Kill DOMRectList. Fixes https://www.w3.org/Bugs/Public/s…

…how_bug.cgi?id=26200

cssom-view/Overview.bs

@@ -994,7 +994,7 @@ dictionary ScrollIntoViewOptions : ScrollOptions {
 };
 
 partial interface Element {
-  DOMRectList getClientRects();
+  sequence<DOMRect> getClientRects();
   DOMRect getBoundingClientRect();
   void scrollIntoView();
   void scrollIntoView((boolean or object) arg);
@@ -1017,9 +1017,9 @@ partial interface Element {
 
 The <dfn method for=Element>getClientRects()</dfn> method, when invoked, must return the result of the following algorithm:
 
-1. If the element on which it was invoked does not have an associated <a>layout box</a> return an empty {{DOMRectList}} object and stop this algorithm.
-1. If the element has an associated <a>SVG layout box</a> return a {{DOMRectList}} object containing a single {{DOMRect}} object that describes the bounding box of the element as defined by the SVG specification, applying the <a>transforms</a> that apply to the element and its ancestors.
-1.  Return a {{DOMRectList}} object containing a list of {{DOMRect}} objects in content order describing the bounding border boxes (including those with a height or width of zero) with the following constraints:
+1. If the element on which it was invoked does not have an associated <a>layout box</a> return an empty sequence and stop this algorithm.
+1. If the element has an associated <a>SVG layout box</a> return a sequence containing a single {{DOMRect}} object that describes the bounding box of the element as defined by the SVG specification, applying the <a>transforms</a> that apply to the element and its ancestors.
+1.  Return a sequence containing {{DOMRect}} objects in content order describing the bounding border boxes (including those with a height or width of zero) with the following constraints:
 
     * Apply the <a>transforms</a> that apply to the element and its ancestors.
     * If the element on which the method was invoked has a computed value for the 'display' property of ''table'' or ''inline-table'' include both the table box and the caption box, if any, but not the anonymous container box.
@@ -1364,14 +1364,14 @@ The objects the methods described below return must be static.
 
 <pre class=idl>
 partial interface Range {
-  DOMRectList getClientRects();
+  sequence<DOMRect> getClientRects();
   DOMRect getBoundingClientRect();
 };
 </pre>
 
 The <dfn method for=Range>getClientRects()</dfn> method, when invoked, must return an empty
-{{DOMRectList}} object if the range is not in the document and
-otherwise a {{DOMRectList}} object containing a list of
+sequence if the range is not in the document and
+otherwise a sequence object containing
 {{DOMRect}} objects in content order that matches the
 following constraints: