Revert "android build: Split process_resources GN rule and script."

This reverts commit be9a5dbbb310fd325785de38f64dc2e1cf75791b.

Reason for revert: Broke resources on Monochrome

Original change's description:
> android build: Split process_resources GN rule and script.
> 
> This is a reland of [1] which got reverted in [2] because the
> former actual broke the internal official build of Clank.
> 
> It turns out that instead of removing |app_as_shared_library = true|,
> for the monochrome apk template, it should be turned into
> |shared_resources = true|.
> 
> Apart from that, see description of the change in the original
> CL, everything still applies.
> 
> [1] https://chromium-review.googlesource.com/c/chromium/src/+/957095
> [2] https://chromium-review.googlesource.com/c/chromium/src/+/968461
> 
> R=​agrieve@chromium.org,yfriedman@chromium.org,estevenson@chromium.org,trevordixon@chromium.org
> 
> Bug: 820459
> Change-Id: I6f6e71c3a13a388c67b68b684c733cd549a2cef0
> Reviewed-on: https://chromium-review.googlesource.com/968870
> Reviewed-by: agrieve <agrieve@chromium.org>
> Commit-Queue: David Turner <digit@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#544300}

TBR=digit@chromium.org,yfriedman@chromium.org,agrieve@chromium.org,estevenson@chromium.org,trevordixon@chromium.org

Change-Id: I2906cc84ab3bf07504a5de6846ec4a747a4f92fc
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 820459, 820591
Reviewed-on: https://chromium-review.googlesource.com/972632
Reviewed-by: agrieve <agrieve@chromium.org>
Commit-Queue: agrieve <agrieve@chromium.org>
Cr-Commit-Position: refs/heads/master@{#544617}
7 files changed