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This reverts commit b05d8793.

Reason for revert: Broke ios full_configs bot. See:
https://ci.chromium.org/p/chromium/builders/ci/ios-simulator-full-configs/25885

Doesn't look like this change triggered the full_config bots on try.

Original change's description:
> Rework generated_script handling in MB.
> 
> It turns out the work I did on the "wrapped_*" targets in
> gn_isolate_map was somewhat overlapping with the already-existing
> iOS work to declare things as "generated_scripts". However, the
> generated_scripts did not include test_env.py.
> 
> So, this CL rearranges things so that the generated script will call
> test_env.py, and then we can share logic between the generated_script
> targets (and every target on iOS and LaCrOS) and use that as the
> basis for the rest of the work going forward.
> 
> Bug: 816629
> Change-Id: I9d55c3f1587defcb599ddf1df838dd9ed5b6a12c
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2357917
> Reviewed-by: Erik Staab <estaab@chromium.org>
> Commit-Queue: Dirk Pranke <dpranke@google.com>
> Cr-Commit-Position: refs/heads/master@{#799171}

TBR=dpranke@google.com,estaab@chromium.org,jeffyoon@chromium.org

Change-Id: I94597d58417f7aa76320579ca282293e6b643811
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 816629
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2364014Reviewed-by: Justin Cohen <justincohen@chromium.org>
Commit-Queue: Justin Cohen <justincohen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#799629}