Revert "[build] Cleanup for specifying [min|target|max]SdkVersion in GN"

This reverts commit 07f70727879b890bcdb8183036e895de375ca695.

Reason for revert:

Findit (https://goo.gl/kROfz5) identified CL at revision 671446 as the
culprit for failures in the build cycles as shown on:
https://analysis.chromium.org/waterfall/culprit?key=ag9zfmZpbmRpdC1mb3ItbWVyRAsSDVdmU3VzcGVjdGVkQ0wiMWNocm9taXVtLzA3ZjcwNzI3ODc5Yjg5MGJjZGI4MTgzMDM2ZTg5NWRlMzc1Y2E2OTUM

Sample Failed Build: https://ci.chromium.org/buildbot/chromium/android-archive-rel/1542

Sample Failed Step: compile

Original change's description:
> [build] Cleanup for specifying [min|target|max]SdkVersion in GN
> 
> crrev/c/1650265 enforced setting [min|target|max]SdkVersion in GN.
> However, this is to strict for some dependencies, e.g. WebRTC.
> Therefore, relax rules so that you can specify the SDK versions in both
> GN and the AndroidManifest.xml. And the build system will assert that
> these values match.
> 
> + Update some SDK versions that had been changed inadvertently in
>   crrev/c/1650265.
> 
> TBR=tedchoc@chromium.org,torne@chromium.org
> 
> Bug: 891996
> Bug: 977417
> Bug: 977328
> Change-Id: I89b944c1f73a35ba8fcdafdf4bdf62508759811e
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1660361
> Reviewed-by: Tibor Goldschwendt <tiborg@chromium.org>
> Reviewed-by: Andrew Grieve <agrieve@chromium.org>
> Reviewed-by: Yusuf Ozuysal <yusufo@chromium.org>
> Reviewed-by: Eric Stevenson <estevenson@chromium.org>
> Commit-Queue: Tibor Goldschwendt <tiborg@chromium.org>
> Auto-Submit: Tibor Goldschwendt <tiborg@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#671446}


Change-Id: I06e05d04cf5e8cbc4c663bd6a5ebfda1ba0b2b3c
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 977328
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1672178
Cr-Original-Commit-Position: refs/heads/master@{#671461}
Cr-Mirrored-From: https://chromium.googlesource.com/chromium/src
Cr-Mirrored-Commit: 92e53a6ae0cee9a38f96eb1926cccfa4027db9d4
2 files changed