Revert "iOS: Save perf results under Documents/perf_result.json"

This reverts commit 10a8e7a9b5261a7e3ce19900ba3511be3b5911f8.

Reason for revert: Speculative revert for broken downstream project.

Original change's description:
> iOS: Save perf results under Documents/perf_result.json
> 
> TBR=henrika@webrtc.org
> 
> Bug: webrtc:7156
> Change-Id: Ib00992cce0007e0b5c9274340df1a892f810b0c5
> Reviewed-on: https://webrtc-review.googlesource.com/29202
> Commit-Queue: Edward Lemur <ehmaldonado@webrtc.org>
> Reviewed-by: Henrik Andreassson <henrika@webrtc.org>
> Reviewed-by: Patrik Höglund <phoglund@webrtc.org>
> Cr-Commit-Position: refs/heads/master@{#21244}

TBR=phoglund@webrtc.org,ehmaldonado@webrtc.org,henrika@webrtc.org

Change-Id: Id10bbddbdfad7042a99cb52f44ac0a753c207d3b
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: webrtc:7156
Reviewed-on: https://webrtc-review.googlesource.com/32641
Reviewed-by: Rasmus Brandt <brandtr@webrtc.org>
Commit-Queue: Rasmus Brandt <brandtr@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#21247}
diff --git a/rtc_base/unittest_main.cc b/rtc_base/unittest_main.cc
index 330bd3f..80b988d 100644
--- a/rtc_base/unittest_main.cc
+++ b/rtc_base/unittest_main.cc
@@ -109,7 +109,7 @@
   rtc::SSLStreamAdapter::enable_time_callback_for_testing();
 
 #if defined(WEBRTC_IOS)
-  rtc::test::InitTestSuite(RUN_ALL_TESTS, argc, argv, false);
+  rtc::test::InitTestSuite(RUN_ALL_TESTS, argc, argv);
   rtc::test::RunTestsFromIOSApp();
 #endif
   const int res = RUN_ALL_TESTS();