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This reverts commit ac412c60.

Reason for revert: checkdeps is failing here:
https://ci.chromium.org/p/chrome/builders/ci/device-builder/48206

Original change's description:
> Have content/DEPS depend on components/variations.
> 
> content/ already depends on components/variations in multiple places;
> see the bug for more details.
> 
> This will also eliminate the need to add additional variations-related
> dependencies in content/renderer/DEPS and content/browser/DEPS, e.g.
> https://chromium-review.googlesource.com/c/chromium/src/+/2411489/2.
> 
> Bug: 1129078
> Change-Id: Id9c8ddef40e70671d4e42ef0b24cdb6239be2f5a
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2414842
> Commit-Queue: Caitlin Fischer <caitlinfischer@google.com>
> Reviewed-by: John Abd-El-Malek <jam@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#807885}

TBR=jam@chromium.org,caitlinfischer@google.com

Change-Id: I7802701fc7939b3d9e3e9d705b86e43e4e30d26b
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 1129078, 1129491
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2416877Reviewed-by: Justin Cohen <justincohen@chromium.org>
Commit-Queue: Justin Cohen <justincohen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#807940}