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CmaBackend still uses task runner in its destructor.

Bug: internal b/150796363
Test: Build
Change-Id: Idfa283dd7f72d06243ba4ab5803971d33035e5c3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2097325
Auto-Submit: Yuchen Liu <yucliu@chromium.org>
Reviewed-by: Kenneth MacKay <kmackay@chromium.org>
Commit-Queue: Yuchen Liu <yucliu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#748974}