Ignore WebViewPlatformBridge apk when merging apks
Ignore WebViewPlatformBridge apk when merging apks

BUG=546822

The apk is failing comparison because of timestamps not content difference,
so ignore it for now.

Review URL: https://codereview.chromium.org/1624693003

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#371077}

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