Revert "[Data Sharing] Making sure SDKDelegate is fully initialized before calling UI delegate methods."

This reverts commit eef9b9b502afcab92369aa8ec495abb00ce198d4.

Reason for revert: Likely candidate for causing test failures on CI bots. crbug.com/393312895

Original change's description:
> [Data Sharing] Making sure SDKDelegate is fully initialized before calling UI delegate methods.
>
> In this CL, making sure SDK delegate is initalised fully before UI
> delegate methods are called. This is to make sure that any of the methods
> of UI delegate using network loader doesn't crash because the network
> loader which is initialised by SDK is not initialised.
>
> Bug: 393184221
> Change-Id: I682538f6a83439323e681b332734e9767e39ca36
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6217143
> Commit-Queue: Ritika Gupta <ritikagup@google.com>
> Reviewed-by: Siddhartha S <ssid@chromium.org>
> Auto-Submit: Ritika Gupta <ritikagup@google.com>
> Cr-Commit-Position: refs/heads/main@{#1413275}

Bug: 393312895
Change-Id: I5c8c98c9cf8c772991cf66f8be80427d844748d0
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6216865
Commit-Queue: Rupert Wiser <bewise@chromium.org>
Owners-Override: Rupert Wiser <bewise@chromium.org>
Bot-Commit: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Cr-Commit-Position: refs/heads/main@{#1413408}