Automatically applying components based on crash stacktrace and information from OWNERS files.

If this is incorrect, please apply the Test-Predator-Wrong-Components label.

Automatically assigning owner based on suspected regression changelist https://chromium.googlesource.com/chromium/src/+/27fc5a3a1f3f1bdfa1e23602260c3d206b9ea79f (Remove AlwaysCreateUserAgentShadowRoot).

If this is incorrect, please remove the owner and apply the Test-Predator-Wrong-CLs label.

Null-ptr deref, and technically it should reproduce on all Blink
platforms.

Actually this is a regression.

Reverting the CL pointed out by comment#2.

With the change, the following HTML can create V0 shadow root
on <input> before its UA shadow root is attached.
```html
<input id="input_element" type="radio">
<script>
var root = input_element.createShadowRoot();
input_element.type = "text/vbs";
</script>
```

Revert CL:
https://chromium-review.googlesource.com/c/chromium/src/+/851852

ClusterFuzz has detected this issue as fixed in range 527241:527247.

Detailed report: https://clusterfuzz.com/testcase?key=6245092213129216

Fuzzer: ifratric-browserfuzzer-v3
Job Type: mac_asan_chrome
Platform Id: mac

Crash Type: Null-dereference READ
Crash Address: 0x000000000010
Crash State:
  blink::ContainerNode::EnsurePreInsertionValidity
  blink::ContainerNode::InsertBefore
  blink::ContainerNode::InsertBefore
  
Sanitizer: address (ASAN)

Regressed: https://clusterfuzz.com/revisions?job=mac_asan_chrome&range=521257:521271
Fixed: https://clusterfuzz.com/revisions?job=mac_asan_chrome&range=527241:527247

Reproducer Testcase: https://clusterfuzz.com/download?testcase_id=6245092213129216

See https://github.com/google/clusterfuzz-tools for more information.

If you suspect that the result above is incorrect, try re-doing that job on the test case report page.

ClusterFuzz testcase 6245092213129216 is verified as fixed, so closing issue as verified.

If this is incorrect, please add ClusterFuzz-Wrong label and re-open the issue.