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As of https://chromium-review.googlesource.com/c/chromium/src/+/1731919,
ChromeContentBrowserClient never creates
DataReductionProxyThrottleManager outside of the UI thread.  Thus, the
use of OnTaskRunnerDeleter is now redundant.

Bug: 824840

Change-Id: I1a38f1898d58cb60dd87896cfa14205f7ac0d426
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1829197Reviewed-by: Clark DuVall <cduvall@chromium.org>
Commit-Queue: Wojciech Dzierżanowski <wdzierzanowski@opera.com>
Cr-Commit-Position: refs/heads/master@{#700849}