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This reverts commit b6c231b5.

Reason for revert: Suspected for causing compiling errors on mac.

Original change's description:
> [ios] Adds the ability to run unittests using XCTest.
> 
> This new functionality is hidden behind both a GN arg
> (enable_run_ios_unittests_with_xctest) and a commandline switch
> (--enable-run-unittests-with-xctest), in order to default it to off
> until the bots are updated to properly run XCTest-based unittests.
> 
> The iOS test runner is updated to run in one of two modes.  When
> --enable-run-unittests-with-xctest is false (the default), behavior is
> unchanged; TestSuite::Run() calls UIApplicationMain(), then the
> UIApplicationDelegate calls TestSuite::Run() again, which actually runs
> the tests when invoked the second time.  When the switch is set to true,
> the second invocation of TestSuite::Run() is made by our XCTestCase
> subclass rather than by the application delegate.
> 
> Xcode provides the ability to run XCTests and XCUITests from the
> commandline, but does not provide any other way to install and run an
> app outside of this test-based workflow.  (We had an alternative that
> used third party libraries, but they no longer work on iOS 13.)  This
> makes it difficult to install and run GoogleTest-based tests on iOS
> devices, since they run as a single self-contained application, but it
> would not be practical to drop GoogleTest support on iOS.  Instead, we
> are exploring invoking these tests via XCTest, which would allow us to
> use Xcode's tooling but still run the same GoogleTest-based tests as on
> other platforms.
> 
> BUG=635509
> 
> Change-Id: I26c67d9c7e16a744f43a20f2d8c5839ca8b3c31a
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1787593
> Reviewed-by: Dirk Pranke <dpranke@chromium.org>
> Reviewed-by: Mark Mentovai <mark@chromium.org>
> Reviewed-by: Justin Cohen <justincohen@chromium.org>
> Commit-Queue: Rohit Rao <rohitrao@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#694749}

TBR=rohitrao@chromium.org,dpranke@chromium.org,justincohen@chromium.org,mark@chromium.org

Change-Id: Ic67605ab0292551500a163e993c6d93fec3048c0
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 635509,1002144
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1791798Reviewed-by: Tarun Bansal <tbansal@chromium.org>
Commit-Queue: Tarun Bansal <tbansal@chromium.org>
Cr-Commit-Position: refs/heads/master@{#694814}