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This is a follow up to http://crrev.com/c/1926920 which adds a
use_webview_provider arg to instrumentation_test_apk. Unfortunately, the
use of --use-webview-provider in gn_isolate_map.pyl for
webview_cts_tests could not be converted to the gn arg because they do
some tricky things and don't use instrumentation_test_apk.

Change-Id: I7843d1210072f989b60bf08561786ac939eee2a2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1930100Reviewed-by: John Budorick <jbudorick@chromium.org>
Reviewed-by: Nate Fischer <ntfschr@chromium.org>
Commit-Queue: Clark DuVall <cduvall@chromium.org>
Cr-Commit-Position: refs/heads/master@{#718318}