Migrate FinancialPing to SimpleURLLoader

URLFetcher will stop working with advent of Network Service, and
SimpleURLLoader is the replacement API for most clients.
This CL migrates RLZTracker and FinancialPing away from URLFetcher.

Bug=773295,844989

Change-Id: I07fc8d09b359727ad8649e38355dd6af2bc60b02
Reviewed-on: https://chromium-review.googlesource.com/1142749
Commit-Queue: Antonio Gomes <tonikitoo@igalia.com>
Reviewed-by: John Abd-El-Malek <jam@chromium.org>
Reviewed-by: Carlos Pizano <cpu@chromium.org>
Reviewed-by: Roger Tawa <rogerta@chromium.org>
Reviewed-by: Matt Menke <mmenke@chromium.org>
Cr-Commit-Position: refs/heads/master@{#582698}
16 files changed