Disallow serializing and transferring non-origin-clean ImageBitmap

This feature brings extra complexity for Cross-Origin-Opener-Policy and
Cross-Origin-Embedder-Policy, and is rarely used.

Relevant discussion:
https://groups.google.com/a/chromium.org/forum/#!topic/blink-dev/Z1XdYf6SjDU

source

@@ -96596,12 +96596,12 @@ dictionary <dfn>ImageBitmapOptions</dfn> {
   are:</p>
 
   <ol>
+   <li><p>If <var>value</var>'s <span data-x="concept-canvas-origin-clean">origin-clean</span>
+   flag is not set, then throw a <span>"<code>DataCloneError</code>"</span>
+   <code>DOMException</code>.
+
    <li><p>Set <var>serialized</var>.[[BitmapData]] to a copy of <var>value</var>'s <span
    data-x="concept-ImageBitmap-bitmap-data">bitmap data</span>.</p></li>
-
-   <li><p>Set <var>serialized</var>.[[OriginClean]] to true if <var>value</var>'s <span
-   data-x="concept-canvas-origin-clean">origin-clean</span> flag is set, and false
-   otherwise.</p></li>
   </ol>
 
   <p>Their <span>deserialization steps</span>, given <var>serialized</var> and <var>value</var>,
@@ -96610,21 +96610,18 @@ dictionary <dfn>ImageBitmapOptions</dfn> {
   <ol>
    <li><p>Set <var>value</var>'s <span data-x="concept-ImageBitmap-bitmap-data">bitmap data</span>
    to <var>serialized</var>.[[BitmapData]].</p></li>
-
-   <li><p>If <var>serialized</var>.[[OriginClean]] is true, set <var>value</var>'s <span
-   data-x="concept-canvas-origin-clean">origin-clean</span> flag.</p></li>
   </ol>
 
   <p>Their <span>transfer steps</span>, given <var>value</var> and <var>dataHolder</var>, are:</p>
 
   <ol>
+   <li><p>If <var>value</var>'s <span data-x="concept-canvas-origin-clean">origin-clean</span>
+   flag is not set, then throw a <span>"<code>DataCloneError</code>"</span>
+   <code>DOMException</code>.
+
    <li><p>Set <var>dataHolder</var>.[[BitmapData]] to <var>value</var>'s <span
    data-x="concept-ImageBitmap-bitmap-data">bitmap data</span>.</p></li>
 
-   <li><p>Set <var>dataHolder</var>.[[OriginClean]] to true if <var>value</var>'s <span
-   data-x="concept-canvas-origin-clean">origin-clean</span> flag is set, and false
-   otherwise.</p></li>
-
    <li><p>Unset <var>value</var>'s <span data-x="concept-ImageBitmap-bitmap-data">bitmap
    data</span>.</p></li>
   </ol>
@@ -96635,9 +96632,6 @@ dictionary <dfn>ImageBitmapOptions</dfn> {
   <ol>
    <li><p>Set <var>value</var>'s <span data-x="concept-ImageBitmap-bitmap-data">bitmap data</span>
    to <var>dataHolder</var>.[[BitmapData]].</p></li>
-
-   <li><p>If <var>dataHolder</var>.[[OriginClean]] is true, set <var>value</var>'s <span
-   data-x="concept-canvas-origin-clean">origin-clean</span> flag.</p></li>
   </ol>
 
   <hr>