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This reverts commit 4ed2234c.

Reason for revert: causes `gn gen --ide=xcode` to fails with error code 250 when targeting iOS (this is caused by an assertion failure in gn in debug mode resulting in a crash in release),

Original change's description:
> generate_wrapper targets for iOS' non-EG/EG2 tests, EG, and EG2 tests
> 
> The existing iOS recipe utilizes an isolate template, and an
> isolated.gen.json file to fill the template in per test with
> config-variables and path-variables. This isolate template contains
> the command arguments to invoke the iOS test runner.
> 
> To support the iOS recipe migration to the Chromium recipe, I use GN to
> generate a script per test target instead of the isolate template. The
> script is pre-baked with arguments to the test runner (run.py). The
> given Swarming task is expected to execute the test by invoking the
> generated script.
> 
> Invoking the generated script requires changes to gn_isolate_map.pyl
> for each iOS test target, and thus, these changes are only additive.
> 
> * "ios_test_runner_wrapper" template wraps the generate_wrapper target.
>  It bakes iOS specific arguments into the script, such that it can
>  launch run.py with the given args.
> * ios_eg2_test, ios_eg_test, and test templates have
>  been updated to utilize the ios_test_runner_wrapper for iOS targets.
> * mb.py to skip generated_directory check when writing isolates.
>  View crbug/ in comments.
> 
> Change-Id: I941d37dfdff0bd1ead1baff70907a197fee3fe64
> Bug: 1055328,912681
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2023748
> Commit-Queue: Jeff Yoon <jeffyoon@chromium.org>
> Reviewed-by: Sylvain Defresne <sdefresne@chromium.org>
> Reviewed-by: John Budorick <jbudorick@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#745105}

TBR=rohitrao@chromium.org,sdefresne@chromium.org,eugenebut@chromium.org,jbudorick@chromium.org,jeffyoon@chromium.org

Change-Id: I649d1051b276738c87ea54633e447ebdadad539f
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 1055328, 912681
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2078260Reviewed-by: Sylvain Defresne <sdefresne@chromium.org>
Commit-Queue: Sylvain Defresne <sdefresne@chromium.org>
Cr-Commit-Position: refs/heads/master@{#745289}