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This reverts commit 63ac6323.

Reason for revert: base_unittests failure: https://ci.chromium.org/p/chromium/builders/ci/Mac10.10%20Tests/43060

Original change's description:
> Promises: Implement Promise<> handle with Then and Catch
> 
> Implements Then and Catch on top of AbstractPromise as well as
> ManualPromiseResolver<> which is needed for testing at this
> stage (PostTask doesn't yet return a promise). It's also
> necessary for promises to interface with old style callback
> based libraries which are extremly common in Chromium.
> 
> Design: https://docs.google.com/document/d/1l12PAJgEtlrqTXKiw6mk2cR2jP7FAfCCDr-DGIdiC9w/edit
> 
> Bug: 906125
> Change-Id: Id7206698f37c59cfc201f3970cbf66a2ef89ee4e
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1599620
> Commit-Queue: Alex Clarke <alexclarke@chromium.org>
> Reviewed-by: Etienne Pierre-Doray <etiennep@chromium.org>
> Reviewed-by: François Doray <fdoray@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#661045}

TBR=fdoray@chromium.org,alexclarke@chromium.org,etiennep@chromium.org

Change-Id: I52dc57a8ba9515ea68101f5e16b1f92a926e594d
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 906125
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1618077Reviewed-by: Collin Baker <collinbaker@chromium.org>
Commit-Queue: Collin Baker <collinbaker@chromium.org>
Cr-Commit-Position: refs/heads/master@{#661122}