Revert of Remove deprecated methods from Pickle. (patchset #10 id:180001 of https://codereview.chromium.org/818833004/)

Reason for revert:
Allegedly causes a performance hit: http://crbug.com/445173

Original issue's description:
> Remove deprecated methods from Pickle.
>
> BUG=444578
> TEST=none
> [email protected]
> [email protected]
>
> Committed: https://chromium.googlesource.com/chromium/src/+/b740bfe23ae7ad244356a4a7538b95ae560251db

[email protected]
NOTREECHECKS=true
NOTRY=true
BUG=444578

Review URL: https://codereview.chromium.org/825353003

Cr-Commit-Position: refs/heads/master@{#309689}
72 files changed