breadcrumbs: migrate KeyedService, ...StorageMgr

This change migrates BreadcrumbManagerKeyedService and
BreadcrumbPersistentStorageManager into the breadcrumbs component.
They are being migrated together because they depend on each other.

BreadcrumbManagerKeyedService depends on BrowserState (iOS-specific)
to determine whether the browser context is off the record or not.
This dependency is removed by passing bool is_off_the_record directly.

BreadcrumbPersistentStorageManager depends on the iOS-specific
BreadcrumbPersistentStorageUtil to get the old filenames for
breadcrumb files (before they were renamed to platform-neutral names).
This dependency is removed by passing the filenames directly.

Bug: 1163762
Change-Id: I0f85c82712e93a8d8067b1f726274a9a84afe899
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2808046
Reviewed-by: Mark Cogan <marq@chromium.org>
Reviewed-by: Henrique Nakashima <hnakashima@chromium.org>
Reviewed-by: Mike Dougherty <michaeldo@chromium.org>
Commit-Queue: Jesse McKenna <jessemckenna@google.com>
Cr-Commit-Position: refs/heads/master@{#873942}