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WebTextCheckClient used to hold strong reference to Blink objects, which
requires explicit cleanup to avoid leaking those objects.

Now that the references have become weak, the explicit cleanup is no
longer needed. Hence, this patch removes the relevant logic.

Bug: 924616
Cq-Include-Trybots: luci.chromium.try:leak_detection_linux; luci.chromium.try:linux_chromium_asan_rel_ng; luci.chromium.try:layout_test_leak_detection
Change-Id: Ied66b4dfd1a6c58d0253c21ddbc007889c91be6a
Reviewed-on: https://chromium-review.googlesource.com/c/1431393Reviewed-by: Kent Tamura <tkent@chromium.org>
Reviewed-by: Yoshifumi Inoue <yosin@chromium.org>
Reviewed-by: Rouslan Solomakhin <rouslan@chromium.org>
Commit-Queue: Xiaocheng Hu <xiaochengh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#625766}