Remove devtools treeoutline keyboard unit tests

These have been ported to frontend unit tests.

Bug: 1148495
Change-Id: Iab9845b29cd1c8fc92d9ab6606c279a613e0abea
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2536330
Commit-Queue: Simon Zünd <szuend@chromium.org>
Auto-Submit: Peter Marshall <petermarshall@chromium.org>
Reviewed-by: Simon Zünd <szuend@chromium.org>
Cr-Commit-Position: refs/heads/master@{#827201}

third_party/blink/web_tests/http/tests/devtools/unit/treeoutline-keyboard-expected.txt

-This tests if the treeoutline responds to navigation keys.
-Selected: 0
-
-Traveling down
-Selected: 1
-Selected: 2
-Selected: 3
-Selected: 4
-Selected: 5
-Selected: 6
-Selected: 7
-Selected: 8
-Selected: 9
-
-Traveling up
-Selected: 8
-Selected: 7
-Selected: 6
-Selected: 5
-Selected: 4
-Selected: 3
-Selected: 2
-Selected: 1
-Selected: 0
-
-End
-Selected: 9
-
-Home
-Selected: 0
-
-Traveling right
-Selected: 0 child
-
-Traveling left
-Selected: 0
-
-Testing nested treeoutlines.
-
-Selecting and expanding first child of inner tree
-Inner child is expanded: YES
-

third_party/blink/web_tests/http/tests/devtools/unit/treeoutline-keyboard.js

-(async function() {
-  TestRunner.addResult("This tests if the treeoutline responds to navigation keys.");
-
-  var treeOutline = new UI.TreeOutlineInShadow();
-  UI.inspectorView.element.appendChild(treeOutline.element);
-
-  for (var i = 0; i < 10; i++) {
-    var treeElement = new UI.TreeElement(String(i), true);
-    treeElement.appendChild(new UI.TreeElement(String(i) + ' child'));
-    treeOutline.appendChild(treeElement)
-  }
-
-  treeOutline.addEventListener(UI.TreeOutline.Events.ElementSelected, event => {
-    TestRunner.addResult('Selected: ' + event.data.title);
-  });
-
-  treeOutline.firstChild().select(false, true);
-
-  var distance = 25;
-
-  TestRunner.addResult("\nTraveling down");
-  for (var i = 0; i < distance; i++)
-    sendKey("ArrowDown");
-
-  TestRunner.addResult("\nTraveling up");
-  for (var i = 0; i < distance; i++)
-    sendKey("ArrowUp");
-
-  TestRunner.addResult("\nEnd");
-  sendKey("End");
-
-  TestRunner.addResult("\nHome");
-  sendKey("Home");
-
-  TestRunner.addResult("\nTraveling right");
-  for (var i = 0; i < distance; i++)
-    sendKey("ArrowRight");
-
-  TestRunner.addResult("\nTraveling left");
-  for (var i = 0; i < distance; i++)
-    sendKey("ArrowLeft");
-
-  TestRunner.addResult("\nTesting nested treeoutlines.");
-  const innerTreeOutline = new UI.TreeOutlineInShadow();
-  const firstInnerChild = new UI.TreeElement('First inner child');
-  const firstInnerGrandChild = new UI.TreeElement('First inner grandchild');
-  innerTreeOutline.appendChild(firstInnerChild);
-  firstInnerChild.appendChild(firstInnerGrandChild);
-
-  const treeElementForNestedTree = new UI.TreeElement(innerTreeOutline.element);
-  treeOutline.appendChild(treeElementForNestedTree);
-
-  TestRunner.addResult("\nSelecting and expanding first child of inner tree");
-  innerTreeOutline.firstChild().select(false, true);
-  sendKey("ArrowRight");
-  TestRunner.addResult(`Inner child is expanded: ${innerTreeOutline.firstChild().expanded ? 'YES' : 'NO'}`);
-
-  TestRunner.completeTest();
-
-  function sendKey(key) {
-    document.deepActiveElement().dispatchEvent(TestRunner.createKeyEvent(key));
-  }
-})();