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This reverts commit a27166e7.

Reason for revert: Suspected many extension test failure: https://ci.chromium.org/p/chromium/builders/ci/Linux%20Tests%20%28dbg%29%281%29/91600

Original change's description:
> Extensions: use preprocessing for generating rollup input
> 
> Bug: 1128583
> Change-Id: If798fc3db54305ccbf2c795c0fae6c332ce34bbf
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2410352
> Commit-Queue: Rebekah Potter <rbpotter@chromium.org>
> Reviewed-by: dpapad <dpapad@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#807199}

TBR=dpapad@chromium.org,rbpotter@chromium.org

Change-Id: I0ec45eec5cd962f42043eed80e0765f8e01e18c7
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 1128583
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2409689Reviewed-by: Yoichi Osato <yoichio@chromium.org>
Commit-Queue: Yoichi Osato <yoichio@chromium.org>
Cr-Commit-Position: refs/heads/master@{#807291}