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No change to the product, this only adds a python script for developers.

This adds a script to remove the pre-installed system image WebView
APKs. This is an adaptation of the guide at
https://www.chromium.org/developers/how-tos/build-instructions-android-webview#TOC-Building

R=jbudorick@chromium.org, torne@chromium.org

Test: adb shell ls /system/app/webview /system/app/WebViewGoogle /system/app/WebViewStub
Test: adb shell pm path com.android.webview
Test: adb shell pm path com.google.android.webview
Change-Id: Ib4a9c9706b15aa4c8ec826eb552a4b7552cff129
Reviewed-on: https://chromium-review.googlesource.com/c/1281964
Commit-Queue: Nate Fischer <ntfschr@chromium.org>
Reviewed-by: John Budorick <jbudorick@chromium.org>
Reviewed-by: Richard Coles <torne@chromium.org>
Cr-Commit-Position: refs/heads/master@{#600876}