Mark some virtual/bidi-caret-affinity tests as flaky

Flake (https://analysis.chromium.org/p/chromium/flake-portal/flakes)
found the 4 web tests as flaky and may fail in all types (fail,
timeout, crash). Hence, this patch marks them so.

Bug: 894651
Tbr: xiaochengh@chromium.org
NoTry: True
Change-Id: I8dca99fef9c6babd173631259febe3b7af48c688
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1503942Reviewed-by: Xiaocheng Hu <xiaochengh@chromium.org>
Commit-Queue: Xiaocheng Hu <xiaochengh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#637870}

third_party/blink/web_tests/TestExpectations

@@ -1790,8 +1790,8 @@ crbug.com/894651 virtual/bidi-caret-affinity/editing/selection/modify_move/move_
 crbug.com/894651 virtual/bidi-caret-affinity/editing/selection/modify_move/move_left_word_04_rtl_multi_line.html [ Failure Crash ]
 crbug.com/894651 virtual/bidi-caret-affinity/editing/selection/modify_move/move_left_word_05_ltr_multi_line.html [ Failure ]
 crbug.com/894651 virtual/bidi-caret-affinity/editing/selection/modify_move/move_left_word_05_rtl_multi_line.html [ Failure ]
-crbug.com/894651 virtual/bidi-caret-affinity/editing/selection/modify_move/move_left_word_06_ltr_multi_line.html [ Failure ]
-crbug.com/894651 virtual/bidi-caret-affinity/editing/selection/modify_move/move_left_word_06_rtl_multi_line.html [ Failure Crash ]
+crbug.com/894651 virtual/bidi-caret-affinity/editing/selection/modify_move/move_left_word_06_ltr_multi_line.html [ Failure Timeout Crash ]
+crbug.com/894651 virtual/bidi-caret-affinity/editing/selection/modify_move/move_left_word_06_rtl_multi_line.html [ Failure Timeout Crash ]
 crbug.com/894651 virtual/bidi-caret-affinity/editing/selection/modify_move/move_left_word_07_ltr_multi_line.html [ Failure ]
 crbug.com/894651 virtual/bidi-caret-affinity/editing/selection/modify_move/move_left_word_07_rtl_multi_line.html [ Failure ]
 crbug.com/894651 virtual/bidi-caret-affinity/editing/selection/modify_move/move_left_word_08_ltr_multi_line.html [ Failure ]
@@ -1812,8 +1812,8 @@ crbug.com/894651 virtual/bidi-caret-affinity/editing/selection/modify_move/move_
 crbug.com/894651 virtual/bidi-caret-affinity/editing/selection/modify_move/move_right_word_04_rtl_multi_line.html [ Failure ]
 crbug.com/894651 virtual/bidi-caret-affinity/editing/selection/modify_move/move_right_word_05_ltr_multi_line.html [ Failure ]
 crbug.com/894651 virtual/bidi-caret-affinity/editing/selection/modify_move/move_right_word_05_rtl_multi_line.html [ Failure ]
-crbug.com/894651 virtual/bidi-caret-affinity/editing/selection/modify_move/move_right_word_06_ltr_multi_line.html [ Failure Crash ]
-crbug.com/894651 virtual/bidi-caret-affinity/editing/selection/modify_move/move_right_word_06_rtl_multi_line.html [ Failure ]
+crbug.com/894651 virtual/bidi-caret-affinity/editing/selection/modify_move/move_right_word_06_ltr_multi_line.html [ Failure Crash Timeout ]
+crbug.com/894651 virtual/bidi-caret-affinity/editing/selection/modify_move/move_right_word_06_rtl_multi_line.html [ Failure Crash Timeout ]
 crbug.com/894651 virtual/bidi-caret-affinity/editing/selection/modify_move/move_right_word_07_ltr_multi_line.html [ Failure ]
 crbug.com/894651 virtual/bidi-caret-affinity/editing/selection/modify_move/move_right_word_07_rtl_multi_line.html [ Failure ]
 crbug.com/894651 virtual/bidi-caret-affinity/editing/selection/modify_move/move_right_word_08_ltr_multi_line.html [ Failure ]