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This CL extracts helper functions GetEnterPassphraseBody and
GetFullEncryptionBody, which makes PeopleHandler::PushSyncPrefs quite a
bit more readable.

One small behavior difference is that before, the "fullEncryptionBody"
string was populated even if the passphrase type was IMPLICIT (i.e. no
actual Sync passphrase in use), but a passphrase *date* was set. That
situation should never occur in the first place, but if it did, then
passing that string made no sense anyway.

Bug: none
Change-Id: I31631483ef14159636846bcf470dfcc74770a8c0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1543259Reviewed-by: Thomas Tangl <tangltom@chromium.org>
Commit-Queue: Marc Treib <treib@chromium.org>
Cr-Commit-Position: refs/heads/master@{#645356}