[Chromecast] Disable compression for cast_shell_apk_assets
[Chromecast] Disable compression for cast_shell_apk_assets

If cast_shell.pak is compressed, then WebKit fails to load resources
on Android TV.

BUG=internal b/28152080
TEST=Build cast_shell_apk_assets

Review URL: https://codereview.chromium.org/1885053004

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#387132}

axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk