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Replace references to domain with manager in TermsOfServiceScreen.

Additionally adjust IDS_TERMS_OF_SERVICE_SCREEN_HEADING and
IDS_TERMS_OF_SERVICE_SCREEN_SUBHEADING to support FlexOrgs by adjusting
the domain placeholder names and descriptions as well as adding
screenshots to make it easier for the translators to understand the
usage of the texts.

Finally replace a call to
BrowserPolicyConnectorChromeOS::GetEnterpriseDisplayDomain with a call
to BrowserPolicyConnectorChromeOS::GetEnterpriseDomainManager.

Bug: b:172684210
Test: Manual
Change-Id: I5acd16c1fa1638fbd6715f355a77ceca21f02bdf
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2593120Reviewed-by: Brian Malcolm <bmalcolm@chromium.org>
Reviewed-by: Denis Kuznetsov [CET] <antrim@chromium.org>
Commit-Queue: Jana Grill <janagrill@chromium.org>
Cr-Commit-Position: refs/heads/master@{#837521}