This reverts commit d6a3040b.

Reason for revert: crbug/1298289

Original change's description:
> New vpython in depot_tools
>
> This change includes commits:
> ef44f81748a55c3aaf028ccfa2ee11876cee1285 Fix vpython filelock
> 275c4196540e1ca41384031b292ad0b89393a5dc Revert "Fix vpython filelock"
> 8aadd8b60a6d3801f62c7e5cebdfe3dc828a1546 Fix vpython filelock
> 43c99d88a24870240c9ca50d67dcfade40b516cc Use resolved path when searching spec
> ffda9381bc01fd33e3c5a889e2ed374312c64ec6 Don't eval python symbol link on windows
> 30a66930f4037fff949d36c45b12f60a40ec524b Include GOARCH to verify cached environment
> 748dcd23529b6b138424914f1e6e265ed70d377b [vpython] Add period to log
>
> Bug:1279621,1158462,1278132,1279684
> Change-Id: I9f7853609309331a5e45939feef906798e7b3a2d
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/3461263
> Reviewed-by: Josip Sokcevic <sokcevic@google.com>
> Commit-Queue: Chenlin Fan <fancl@chromium.org>

Bug: 1279621,1158462,1278132,1279684
Change-Id: I31c3ca9985c3596317152412b522c1209a36419b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/3474811Reviewed-by: Josip Sokcevic <sokcevic@google.com>
Commit-Queue: Josip Sokcevic <sokcevic@google.com>