Between Jul. 29 2018 and Aug. 20 2018: Make every $modules property protected on classes extending BrowserTestBase and KernelTestBase

Problem/Motivation

Make $modules protected on BrowserTestBase and KernelTestBase.

Use something like

find . -path './.git' -prune -o -not \( -name '*.js' \) -type f -path '*/tests/*' -exec sed -i -e 's/public static $modules/protected static $modules/g' {} \;

Proposed resolution

Remaining tasks

User interface changes

API changes

Data model changes