Revert "[tools/perf] Make upload_trace_processor build target visible"

This reverts commit ae260266.

Reason for revert: breaks deterministic bots, see 
https://bugs.chromium.org/p/chromium/issues/detail?id=1066246

Original change's description:
> [tools/perf] Make upload_trace_processor build target visible
> 
> BUILD.gn files are read by ninja only if something depends on targets
> defined in them. So to make targets in perfetto_binary_roller folder
> visible, we provide a special group with a dependency on a target
> from it.
> 
> Bug: 1050517
> Change-Id: I99ca73f11c2a00f70eade250ae9dff93d3c9d3af
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2124378
> Reviewed-by: Wenbin Zhang <wenbinzhang@google.com>
> Reviewed-by: John Chen <johnchen@chromium.org>
> Commit-Queue: Mikhail Khokhlov <khokhlov@google.com>
> Cr-Commit-Position: refs/heads/master@{#754594}

TBR=johnchen@chromium.org,khokhlov@google.com,wenbinzhang@google.com

Change-Id: If31ba360d91f100664e51c1ff0186bc8030882cf
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 1050517
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2128828Reviewed-by: Rebekah Potter <rbpotter@chromium.org>
Commit-Queue: Rebekah Potter <rbpotter@chromium.org>
Cr-Commit-Position: refs/heads/master@{#754673}

tools/perf/BUILD.gn

@@ -93,9 +93,3 @@ group("perf_without_chrome") {
     data_deps += [ "//chrome/android/webapk/shell_apk:maps_go_webapk" ]
   }
 }
-
-# This group makes visible those targets in subdirectories that are not
-# explicitly depended on.
-group("gn_all") {
-  deps = [ "//tools/perf/core/perfetto_binary_roller:upload_trace_processor" ]
-}