GitLab

Instead of directly calling SafeSeedManager::RegisterPrefs, WebView
should call VariationsService::RegisterPrefs, as Chrome does.
VariationsService::RegisterPrefs calls SafeSeedManager::RegisterPrefs
and VariationsSeedStore::RegisterPrefs. The latter registers
kVariationsSafeCompressedSeed, which prevents the crash:
"Trying to read an unregistered pref: variations_safe_compressed_seed".

BUG=842934

Change-Id: I2f4fa631c2e03ecc650bb051e2050a89b7676e6e
Reviewed-on: https://chromium-review.googlesource.com/1060427Reviewed-by: Tao Bai <michaelbai@chromium.org>
Commit-Queue: Paul Miller <paulmiller@chromium.org>
Cr-Commit-Position: refs/heads/master@{#558866}