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    <body><span class="vcard"><a class="email" href="mailto:simon.fraser&#64;apple.com" title="Simon Fraser (smfr) &lt;simon.fraser&#64;apple.com&gt;"> <span class="fn">Simon Fraser (smfr)</span></a>
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              <a class="bz_bug_link 
          bz_status_NEW "
   title="NEW - Fix crash due to RemoteLayerTreeDisplayRefreshMonitor outliving RemoteLayerTreeDrawingArea"
   href="https://bugs.webkit.org/show_bug.cgi?id=147124">bug 147124</a>
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            <th>What</th>
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           <td style="text-align:right;">Attachment #257135 Flags</td>
           <td>review?, commit-queue?
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           <td>review-, commit-queue-
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            <b><a class="bz_bug_link 
          bz_status_NEW "
   title="NEW - Fix crash due to RemoteLayerTreeDisplayRefreshMonitor outliving RemoteLayerTreeDrawingArea"
   href="https://bugs.webkit.org/show_bug.cgi?id=147124#c3">Comment # 3</a>
              on <a class="bz_bug_link 
          bz_status_NEW "
   title="NEW - Fix crash due to RemoteLayerTreeDisplayRefreshMonitor outliving RemoteLayerTreeDrawingArea"
   href="https://bugs.webkit.org/show_bug.cgi?id=147124">bug 147124</a>
              from <span class="vcard"><a class="email" href="mailto:simon.fraser&#64;apple.com" title="Simon Fraser (smfr) &lt;simon.fraser&#64;apple.com&gt;"> <span class="fn">Simon Fraser (smfr)</span></a>
</span></b>
        <pre>Comment on <span class=""><a href="attachment.cgi?id=257135&amp;action=diff" name="attach_257135" title="Patch">attachment 257135</a> <a href="attachment.cgi?id=257135&amp;action=edit" title="Patch">[details]</a></span>
Patch

View in context: <a href="https://bugs.webkit.org/attachment.cgi?id=257135&amp;action=review">https://bugs.webkit.org/attachment.cgi?id=257135&amp;action=review</a>

<span class="quote">&gt; Source/WebKit2/WebProcess/WebPage/Cocoa/RemoteLayerTreeDisplayRefreshMonitor.mm:78
&gt; +void RemoteLayerTreeDisplayRefreshMonitor::clearDrawingArea()
&gt; +{
&gt; +    m_drawingArea = nullptr;
&gt; +}</span >

You don't need this. The WeakPtr does this for you.

<span class="quote">&gt; Source/WebKit2/WebProcess/WebPage/mac/RemoteLayerTreeDrawingArea.mm:95
&gt; +    for (RemoteLayerTreeDisplayRefreshMonitor* monitor : m_displayRefreshMonitors)
&gt; +        monitor-&gt;clearDrawingArea();</span >

This is not needed.</pre>
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