Revert "Update to futures 0.2.1"

This reverts commit 7ae8040c22fdfa742cf6efe86debb21556704162.

Reason for revert: <INSERT REASONING HERE>

Original change's description:
> Update to futures 0.2.1
> 
> Change-Id: Id3c4020f95da939222902910838b9a50f15117c4

TBR=tkilbourn@google.com,cramertj@google.com

Change-Id: I5bd823f8ad918311fdd41b0a959bb9bd21ac315c
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
561 files changed
tree: 5b66cd07b4a0ee86806dd5843e0a529383a2295e
  1. .vendor-update.stamp
  2. AUTHORS
  3. CONTRIBUTING.md
  4. LICENSE
  5. README.md
  6. vendor/
README.md

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