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Build boundary interfaces as a jar using java-library plugin instead of
"com.android.library" plugin. This makes it simpler and easier to embed
the compiled jar in webkit AAR file without any dirty workarounds like
unzipping the AAR or accessing intermediates build files.

Removing AndroidManifest.xml file since it's no longer needed by android
library plugin.

Bug: https://issuetracker.google.com/issues/142394338
Bug: https://issuetracker.google.com/issues/140178227
Test: manually cherry-pick change to //external and run gradlew :webkit:assembleRelease and gradlew :webview-support-interfaces:assembleRelease
Change-Id: I1df2f04bb737c1f376d7d1a70c6c5d0664e2f39c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1859990Reviewed-by: Aurimas Liutikas <aurimas@chromium.org>
Reviewed-by: Nate Fischer <ntfschr@chromium.org>
Commit-Queue: Hazem Ashmawy <hazems@chromium.org>
Cr-Commit-Position: refs/heads/master@{#706177}