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

This reverts commit 8b886bb077d54e2bf6198559557ae97b03023611.

Reason for revert: Breaks downstream projects.

Original change's description:
> Reland "iOS: Save perf results under Documents/perf_result.json"
> 
> This will require a manual roll to downstream projects, since
> the //test:perf_test target was introduced.
> 
> This is a reland of 10a8e7a9b5261a7e3ce19900ba3511be3b5911f8
> 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=henrika@webrtc.org, phoglund@webrtc.org
> 
> No-Try: true
> Bug: webrtc:7156
> Change-Id: Iecdb108f605fd1c98acde4d50ab4f5a7b5f6bfaf
> Reviewed-on: https://webrtc-review.googlesource.com/32761
> Reviewed-by: Edward Lemur <ehmaldonado@webrtc.org>
> Commit-Queue: Edward Lemur <ehmaldonado@webrtc.org>
> Cr-Commit-Position: refs/heads/master@{#21252}

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

Change-Id: If4c72fa61dba3a3157fb9696b7f22664522b9467
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: webrtc:7156
Reviewed-on: https://webrtc-review.googlesource.com/33040
Reviewed-by: Mirko Bonadei <mbonadei@webrtc.org>
Commit-Queue: Mirko Bonadei <mbonadei@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#21279}

modules/audio_coding/BUILD.gn

@@ -1344,7 +1344,6 @@ if (rtc_include_tests) {
       "../../rtc_base:rtc_base_approved",
       "../../system_wrappers",
       "../../system_wrappers:field_trial_api",
-      "../../test:perf_test",
       "../../test:test_support",
     ]
 
@@ -1840,7 +1839,6 @@ if (rtc_include_tests) {
 
     deps = [
       ":isac_fix",
-      "../../test:perf_test",
       "../../test:test_support",
     ]