Fix broken paths in `NativeFunctions.js` generator
Fix broken paths in `NativeFunctions.js` generator

`scripts/javascript_natives/index.js` expects `NativeFunctions.js` to
reside at a specific path, and broke when a CL [1] moved it to another
location, and broke (in another way) when the DevTools front-end
codebase moved to a separate repository. Similarly, the script expects
a Chromium checkout at a specific location relative to itself, which
hasn’t been correct since the DevTools front-end codebase moved to a
separate repository.

This patch updates the expected locations, but does not re-generate
the output since the script requires additional follow-up fixes.

[1]: https://chromium-review.googlesource.com/c/devtools/devtools-frontend/+/2814662

Bug: chromium:1255619
Change-Id: I066fb4349f045df5a12edd1378d7acdaa733a61b
Reviewed-on: https://chromium-review.googlesource.com/c/devtools/devtools-frontend/+/3201677
Reviewed-by: Tim van der Lippe <dba8716ee7f8d16236046f74d2167cb94410f6ed@chromium.org>
Commit-Queue: Mathias Bynens <17a2cbc4e33156874a9862b0f530521117e66a3d@chromium.org>

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