Remove getApplicationContext calls from invalidation

Continuation of work in bug 646094.
Preparing to activate an errorprone check to flag
context#getApplicationContext calls. The goal is to prevent storing the
resulting context as a class property, and instead use ContextUtils.

Bug: 846456
Change-Id: Id41629487bc76880136d8e33529dd37ca3c4e34e
Reviewed-on: https://chromium-review.googlesource.com/1095955
Reviewed-by: Yaron Friedman <yfriedman@chromium.org>
Reviewed-by: Nicolas Zea <zea@chromium.org>
Commit-Queue: Yaron Friedman <yfriedman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#576888}
12 files changed