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This was accidentally removed in crrev.com/c/1880070, and causes a
crash when launching the license activity. I tested the aforementioned
CL by selecting "System WebView licenses" in the Settings UI, but it
turns out that launches the first android.settings.WEBVIEW_LICENSE
activity it finds in the system image, so it wasn't actually testing my
change.

This also removes an about_ui_android dependency from
//aw:libwebviewchromium since that's already in //aw:apk where it
belongs.

Test: adb shell am start -n com.google.android.apps.chrome/org.chromium.android_webview.app.LicenseActivity
Bug: 934152
Change-Id: I8115d6bd5291249da0b6c625c5f210b0d953c62b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1904615
Commit-Queue: Robbie McElrath <rmcelrath@chromium.org>
Reviewed-by: Nate Fischer <ntfschr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#714609}