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This reverts commit aae3a263.

Reason for revert: breaks fuchsia_x64 on cq, crbug.com/1099786

Original change's description:
> Sync: Delete ModelTypeHelper.java
> 
> It was part of the old invalidations implementation, and not used
> anymore.
> This was the last reference from sync to third_party/cacheinvalidation,
> so all references to that are also removed from BUILD.gn and DEPS
> files.
> 
> Bug: 1099672
> Change-Id: I3491fa1cea04d0deebe68988cd3af5a5a4da1afb
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2270182
> Commit-Queue: Mikel Astiz <mastiz@chromium.org>
> Auto-Submit: Marc Treib <treib@chromium.org>
> Reviewed-by: Mikel Astiz <mastiz@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#783025}

TBR=treib@chromium.org,mastiz@chromium.org

Change-Id: I463dd6d98c8b2c93734628557c01c376b231b62f
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 1099672
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2269746Reviewed-by: Nico Weber <thakis@chromium.org>
Commit-Queue: Nico Weber <thakis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#783043}