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This reverts commit 6a309aad.

Reason for revert: Downstream CL needs to land first

Original change's description:
> [iOS] Remove all EG1 test targets and related GN components.
> 
> Removed all test targets, EG1 specific test utils in GN files.
> Removed gni files to build EG1 targets.
> Removed build files in ios/third_party/earl_grey.
> 
> Bug: 1046369
> Change-Id: Iec1d60fa40d10969c4e6e6840f2983b02c3170dc
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2275353
> Commit-Queue: Zhaoyang Li <zhaoyangli@chromium.org>
> Reviewed-by: Rohit Rao <rohitrao@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#784204}

TBR=rohitrao@chromium.org,zhaoyangli@chromium.org

Change-Id: Ied75d5546cde0ff5c3d605e7c005981a8fc26c3e
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 1046369
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2276812Reviewed-by: Rohit Rao <rohitrao@chromium.org>
Commit-Queue: Rohit Rao <rohitrao@chromium.org>
Cr-Commit-Position: refs/heads/master@{#784207}