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This allows it to be brotli-compressed, saving 560kb for both
SystemWebview.apk and TrichromeWebview.apk.

The Monochrome Webview Stub APK continues to use licenses as an asset.

Moves WebViewApplication from glue/ -> apk/ and renames it to
"WebViewApkApplication" in order to not conflict with not-yet-updated
downstream glue/ code.

Bug: 734846
Change-Id: Icb0655057eae4ef80117f59cb060c1f596abf646
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1612660Reviewed-by: Richard Coles <torne@chromium.org>
Reviewed-by: Demetrios Papadopoulos <dpapad@chromium.org>
Reviewed-by: Bo <boliu@chromium.org>
Commit-Queue: Andrew Grieve <agrieve@chromium.org>
Cr-Commit-Position: refs/heads/master@{#660993}