Revert "Add OfflineTestUtil.java"

This reverts commit 110457cd42496fc3866e3f0992781d979c3435f7.

Reason for revert: This broke the downstream waterfall:
https://logs.chromium.org/logs/chrome/bb/internal.client.clank/arm-builder/19127/+/recipes/steps/compile/0/stdout

I'll follow up with a fixed CL

Original change's description:
> Add OfflineTestUtil.java
> 
> This class includes common utilities for OfflinePages tests.
> I moved a few test functions from OfflinePageBridge to this new class. This has
> the advantage that these functions (and their c++ implementations) are only
> included in test targets.
> 
> Note, this was done in advance of adding an additional java test that will
> benefit from this change.
> 
> Change-Id: Id1bdbf50c600d5f3bb3cc456fc824f32039c42fe
> Reviewed-on: https://chromium-review.googlesource.com/c/1394731
> Reviewed-by: Carlos Knippschild <carlosk@chromium.org>
> Reviewed-by: Brian Sheedy <bsheedy@chromium.org>
> Commit-Queue: Dan H <harringtond@google.com>
> Cr-Commit-Position: refs/heads/master@{#620840}

TBR=carlosk@chromium.org,bsheedy@chromium.org,harringtond@google.com

Change-Id: I859553e16d0c6ce5eed815a36b5dbe61651c4f1d
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://chromium-review.googlesource.com/c/1401564
Reviewed-by: Dan H <harringtond@google.com>
Commit-Queue: Dan H <harringtond@google.com>
Cr-Commit-Position: refs/heads/master@{#620887}
12 files changed