Revert "Bump package:usage."

This reverts commit b4c19b9.

Reason for revert: http://b/199988795

Original change's description:
> Bump package:usage.
>
> Most of these are from a single PR that did not get squashed.
>
> Running `git log --format=%C(auto) %h %s e0780cd8b2f8af69a28dc52678ffe8492da27d06..016dd302b494e4ff70a7850957ec895eced9d220` in third_party/pkg/usage ✓
>  016dd30 Prepare release (#160)
>  076c653 Merge pull request #152 from sigurdm/batching
>  1d6b343 Remove debug print
>  c073fb7 Use correct limit for bytes
>  1d89875 Send batch early if full
>  2896a85 Update README.md
>  da20fab Delete travis.sh
>  7c351a3 Merge
>  0424091 Update build.yaml (#159)
>  4f2a050 Use a Duration for batching delay
>  aa3f3ce address review
>  318ebe5 Fix
>  71ddec1 Send remaining hits on waitForLastPing
>  1c895a7 Parametrize client-id in test
>  0ae7733 Fix pubspec
>  2255b3d Merge remote-tracking branch 'origin/master' into batching
>  14d3702 Merge remote-tracking branch 'origin/master' into batching
>  1c3393d Handle batching implicit waiting for a 'batchDelay' future
>  219b764 TODO about size of payloads
>  aaee6d9 Fix AnalyticsMock
>  a8ec5b4 Remove mockito as dep - didn't use it
>  e26fcce Allow batching of hits
>
> Change-Id: I801c0d9114fb90e1dc94c3e2552c1cd90a8f0c18
> Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/213349
> Reviewed-by: Jonas Jensen <[email protected]>
> Commit-Queue: Sigurd Meldgaard <[email protected]>

[email protected],[email protected]

Change-Id: I3b044a1744bbe5aade9c75fecb9d057d6564ddda
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/213440
Reviewed-by: Michal Terepeta <[email protected]>
Reviewed-by: Jonas Jensen <[email protected]>
Commit-Queue: Michal Terepeta <[email protected]>

Author: michalt

DEPS

@@ -163,7 +163,7 @@ vars = {
   "test_reflective_loader_rev": "fcfce37666672edac849d2af6dffc0f8df236a94",
   "test_rev": "099dcc4d052a30c6921489cfbefa1c8531d12975",
   "typed_data_rev": "29ce5a92b03326d0b8035916ac04f528874994bd",
-  "usage_rev": "016dd302b494e4ff70a7850957ec895eced9d220",
+  "usage_rev": "e0780cd8b2f8af69a28dc52678ffe8492da27d06",
   "vector_math_rev": "0c9f5d68c047813a6dcdeb88ba7a42daddf25025",
   "watcher_rev": "3924194385fb215cef483193ed2879a618a3d69c",
   "webdriver_rev": "ff5ccb1522edf4bed578ead4d65e0cbc1f2c4f02",