Revert "Add wrapper to normalize flags."

This reverts commit 642a49d1eb20b8c5744e745de79ddb585e0f7472.

Reason for revert: Speculative revert, may cause infra failures on perf waterfall

Original change's description:
> Add wrapper to normalize flags.
>
> Bug: None
> Change-Id: I9d43602cc66198a29dbc0e7586d948ee76c5ec84
> Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/145204
> Commit-Queue: Mirko Bonadei <mbonadei@webrtc.org>
> Reviewed-by: Oleh Prypin <oprypin@webrtc.org>
> Cr-Commit-Position: refs/heads/master@{#28532}

TBR=mbonadei@webrtc.org,oprypin@webrtc.org

# Not skipping CQ checks because original CL landed > 1 day ago.

No-Try: True
Bug: None
Change-Id: I1a559931b51b2b4614e765978200d47ee37f9186
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/145328
Commit-Queue: Artem Titarenko <artit@webrtc.org>
Reviewed-by: Artem Titarenko <artit@webrtc.org>
Reviewed-by: Mirko Bonadei <mbonadei@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#28554}
diff --git a/BUILD.gn b/BUILD.gn
index d3c1ed5..af0de9f 100644
--- a/BUILD.gn
+++ b/BUILD.gn
@@ -609,8 +609,7 @@
       "video:video_pc_full_stack_tests",
     ]
 
-    data =
-        webrtc_perf_tests_resources + [ "tools_webrtc/flags_compatibility.py" ]
+    data = webrtc_perf_tests_resources
     if (is_android) {
       deps += [ "//testing/android/native_test:native_test_native_code" ]
       shard_timeout = 4500