Convert from base::{LazyInstance,Singleton} to base::NoDestructor

The class base::NoDestructor is a simpler way to define a static
global value (aka a singleton) than base::{LazyInstance,Singleton}
and is the recommended pattern to use.

The changes were automated using a custom one-shot script, then
fine tuned by hand (to remove unnecessary classes, ...).

This fixes usages in src/ios/chrome/browser/ui/webui.

This CL was uploaded by git cl split.

Bug: none
Change-Id: I0f2864e73cf4e99a07384d29dfd0c5c705a9dc85
Reviewed-on: https://chromium-review.googlesource.com/c/1411785
Reviewed-by: Mike Dougherty <michaeldo@chromium.org>
Commit-Queue: Sylvain Defresne <sdefresne@chromium.org>
Cr-Commit-Position: refs/heads/master@{#623178}
2 files changed