[fuchsia] Disable flaky AccessibilityBridgeTest.Slider test.

Bug: 1168167
Change-Id: I2972d60b27925816579629f164c26a18a9892886
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2637583
Commit-Queue: Wez <wez@chromium.org>
Commit-Queue: Marina Ciocea <marinaciocea@chromium.org>
Auto-Submit: Wez <wez@chromium.org>
Reviewed-by: Marina Ciocea <marinaciocea@chromium.org>
Cr-Commit-Position: refs/heads/master@{#844813}

fuchsia/engine/browser/accessibility_bridge_browsertest.cc

@@ -378,7 +378,9 @@ IN_PROC_BROWSER_TEST_F(AccessibilityBridgeTest,
   EXPECT_FALSE(is_offscreen);
 }
 
-IN_PROC_BROWSER_TEST_F(AccessibilityBridgeTest, Slider) {
+// TODO(1168167): Test sets node-updated callback only after triggering node
+// update, making it flaky.
+IN_PROC_BROWSER_TEST_F(AccessibilityBridgeTest, DISABLED_Slider) {
   LoadPage(kPage1Path, kPage1Title);
 
   semantics_manager_.semantic_tree()->RunUntilNodeCountAtLeast(kPage1NodeCount);