[Switch Access] Allow rows with only 1 element

Previously, having a row with only 1 element threw an error. However,
in the emoji keyboard there are places where that is the most logical
grouping. Remove that check.

AX-Relnotes: n/a.
Fixed: 1127070
Change-Id: I61aa71ae20fbf3aa0015b12fceb50cf66ba271fd
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2406658
Commit-Queue: David Tseng <dtseng@chromium.org>
Reviewed-by: Akihiro Ota <akihiroota@chromium.org>
Cr-Commit-Position: refs/heads/master@{#806908}

chrome/browser/resources/chromeos/accessibility/switch_access/nodes/group_node.js

@@ -139,12 +139,6 @@ class GroupNode extends SAChildNode {
         children.push(nodes[i]);
         i++;
       }
-      if (children.length <= 1) {
-        throw SwitchAccess.error(
-            SAConstants.ErrorType.ROW_TOO_SHORT,
-            'Cannot group row with only one element.',
-            true /* shouldRecover */);
-      }
 
       result.push(new GroupNode(children));
     }