Reviewers: arv, caitp, rossberg, yhirano,

Message:
Created Revert of Promise assimilation fix.

Description:
Revert of Promise assimilation fix. (patchset #8 id:160001 of
https://codereview.chromium.org/1098663002/)

Reason for revert:
Test failures:
https://chromegw.corp.google.com/i/client.v8/builders/V8%20Linux64/builds/3829

Original issue's description:
Promise assimilation fix.

Let x be a fulfilled promise and y be another promise. |x.then(() => y)|
should call |y.then|, but the current implementation calls PromiseChain.
We can see the difference when we set a custom function to |y.then|.

This CL fixes the spec violation, but as a result |then| is no longer
a wrapper of |chain| and in some cases it does not work well with
|accept| or |chain|. That is not a problem for ES6 promise users because
ES6 promise doesn't have them.

LOG=N
BUG=477921

Committed: https://crrev.com/2f57dff3ea0c45e1a61b334fda962460f89d71bc
Cr-Commit-Position: refs/heads/master@{#28926}

[email protected],[email protected],[email protected],[email protected]
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=477921

Please review this at https://codereview.chromium.org/1176163004/

Base URL: git://github.com/v8/v8.git@master

Affected files (+40, -231 lines):
  M src/promise.js
  M test/mjsunit/es6/promises.js


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