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This reverts commit 04d9ccbc.

Reason for revert: https://crbug.com/1063165

Original change's description:
> [AW] DevUI: Always merge dev ui launcher manifest to the final manifest
> 
> Always merge dev ui launcher manifest for standalone and trichrome
> webview into the final manifest unconditionally similar to monochrome
> launcher manifest.
> 
> Use jinja_template to:
> - Generate the manifests for all variants from one Manifest file.
> - Pass a variable to determine the default enabled state for the
>   launcher activity-alias.
> 
> Standalone, Trichrome and Monochrome WebView, all use one activity-alias
> to show the launcher icon.
> 
> Change the name and the behaviour of the GN flag to always show the
> launcher icon. If the flag is set to true then Monochrome will always
> show the icon unconditionally.
> 
> Fixed: 1047824
> Test: Enable/Disable the flag for stable/prestable WebView variants
> Test: check no changes permissions in standalone and trichrome manifest
> Change-Id: Ida10e39e294715e69ad19f1253cf302113322cc1
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2098804
> Reviewed-by: Richard Coles <torne@chromium.org>
> Reviewed-by: Nate Fischer <ntfschr@chromium.org>
> Commit-Queue: Hazem Ashmawy <hazems@chromium.org>
> Auto-Submit: Hazem Ashmawy <hazems@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#751735}

TBR=torne@chromium.org,ntfschr@chromium.org,hazems@chromium.org

Change-Id: I7fea8cf56a9396d30ac272de4a870e0b4bcb9c99
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2111950Reviewed-by: Brian Sheedy <bsheedy@chromium.org>
Commit-Queue: Brian Sheedy <bsheedy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#751873}