dumpacctree testsuite: children property shall not be exposed in

the formatted tree

Correct implementation of
https://chromium-review.googlesource.com/c/chromium/src/+/2412192:
* optimal since children are not populated and not appended into
a tree dictionary structure
* clean because all logic is kept by tree formatter

Bug: n/a
Change-Id: Ic4108c407d6f6d9b4786dd188efbd57b4648684d
AX-Relnotes: n/a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2481762Reviewed-by: Dominic Mazzoni <dmazzoni@chromium.org>
Commit-Queue: Alexander Surkov <asurkov@igalia.com>
Cr-Commit-Position: refs/heads/master@{#818605}

content/browser/accessibility/accessibility_tree_formatter_mac.mm

@@ -498,7 +498,13 @@ std::string AccessibilityTreeFormatterMac::ProcessTreeForOutput(
       continue;
     }
 
-    // Special processing for position and size.
+    // Special case: children.
+    // Children are used to generate the tree
+    // itself, thus no sense to expose them on each node.
+    if (item.first == kChildrenDictAttr) {
+      continue;
+    }
+    // Special case: position.
     if (item.first == kPositionDictAttr) {
       WriteAttribute(false,
                      FormatCoordinates(
@@ -507,6 +513,7 @@ std::string AccessibilityTreeFormatterMac::ProcessTreeForOutput(
                      &line);
       continue;
     }
+    // Special case: size.
     if (item.first == kSizeDictAttr) {
       WriteAttribute(
           false,

tools/accessibility/inspect/ax_tree_server.cc

@@ -83,9 +83,6 @@ std::vector<ui::AXPropertyFilter> AXTreeServer::GetPropertyFilters(
   if (filters_path.empty()) {
     return {
       ui::AXPropertyFilter("*", ui::AXPropertyFilter::ALLOW),
-#if defined(OS_MAC)
-          ui::AXPropertyFilter("children", ui::AXPropertyFilter::DENY),
-#endif
     };
   }