DumpAccTree testing: remove haspopup from default blink filters

Indeed haspopup is not a state and always used with a value, for example, haspopup=menu, thus the filter makes no sense

Bug: 1100991
Change-Id: I37b6232e6d36e56892454107e729a5533c6d0ee9
AX-Relnotes: n/a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2323561
Commit-Queue: Dominic Mazzoni <dmazzoni@chromium.org>
Reviewed-by: Dominic Mazzoni <dmazzoni@chromium.org>
Cr-Commit-Position: refs/heads/master@{#792801}

content/browser/accessibility/accessibility_tree_formatter_blink.cc

@@ -166,7 +166,6 @@ void AccessibilityTreeFormatterBlink::AddDefaultFilters(
   // Too flaky: hovered, offscreen
   // States
   AddPropertyFilter(property_filters, "collapsed");
-  AddPropertyFilter(property_filters, "haspopup");
   AddPropertyFilter(property_filters, "invisible");
   AddPropertyFilter(property_filters, "multiline");
   AddPropertyFilter(property_filters, "protected");