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This reverts commit 137ad170.

Reason for revert: Fix did not help

Original change's description:
> Fix testRepostFormAfterReload for slim-nav.
> 
> crrev.com/c/1632591 changed test behavior to wait until reload is
> finished for slim nav, which broke the test.
> 
> This CL restores the original behavior, so the test does not wait until
> reload is finished.
> 
> Added -[ChromeEarlGreyImpl reloadAndWaitForCompletion:] to compliment
> existing -[ChromeEarlGreyImpl loadURL:waitForCompletion:]
> 
> Bug: 968296
> Change-Id: I86d1d982424ee4f56c64ac4cae522f1070d116ab
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1636570
> Commit-Queue: Eugene But <eugenebut@chromium.org>
> Reviewed-by: Justin Cohen <justincohen@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#664544}

TBR=justincohen@chromium.org,eugenebut@chromium.org

Change-Id: Iaedd550ba2dde2abca2c52849a41951f8ba2c336
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 968296
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1636921Reviewed-by: Eugene But <eugenebut@chromium.org>
Commit-Queue: Eugene But <eugenebut@chromium.org>
Cr-Commit-Position: refs/heads/master@{#664609}