Revert "Correct ParagraphBuilder::getText() behavior"

This reverts commit fce12076322a30ec5afb36257d7f0288786b033f.

Reason for revert: Build break (and merge problem)

Original change's description:
> Correct ParagraphBuilder::getText() behavior
>
> And make sure that no text modifications could be done
> after ParagraphBuilder::Build() until Reset()
>
> Change-Id: I5e7b2a99fb4577ddd41e23d153783642d606aaef
> Reviewed-on: https://skia-review.googlesource.com/c/skia/+/618518
> Reviewed-by: Julia Lavrova <jlavrova@google.com>
> Reviewed-by: Ben Wagner <bungeman@google.com>
> Commit-Queue: Julia Lavrova <jlavrova@google.com>

Change-Id: If3bb583fb0d05ba0ab3fb8fc58c7632fe32d68fc
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/631836
Commit-Queue: Julia Lavrova <jlavrova@google.com>
Bot-Commit: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
2 files changed