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[Android] Move APK installation into WPTAdapter subclasses

This CL adds the _install_apks function to each WPTAdapter subclass
which will install APKs for each browser.

TBR=martiniss@chromium.org

Bug: 1050754
Change-Id: I7cea7869ab4e498adf0e8215b8b78796f3b4df4d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2116779
Commit-Queue: Rakib Hasan <rmhasan@google.com>
Reviewed-by: Andrew Luo <aluo@chromium.org>
Cr-Commit-Position: refs/heads/master@{#753070}