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The Google C++ style guide recommends explicit constructors, with a few
exceptions where implicit conversion is desirable. Implicit conversion
between TaskRunner and RefCountedDeleteOnSequence seems surprising.

This CL does not introduce any functional changes.

Change-Id: I1ccf85fa5a673e7a91dd6090676788d682890412
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2634866
Auto-Submit: Victor Costan <pwnall@chromium.org>
Reviewed-by: Gabriel Charette <gab@chromium.org>
Commit-Queue: Gabriel Charette <gab@chromium.org>
Cr-Commit-Position: refs/heads/master@{#844781}