Reverts "Run gen_snapshot under /usr/bin/time (#55777)" (#55787)

Reverts: #55777
Initiated by: matanlurey
Reason for reverting: Breaks CI postsubmit (https://ci.chromium.org/ui/p/flutter/builders/prod/Mac%20Production%20Engine%20Drone/485517/overview).
Original PR Author: aam

Reviewed By: {matanlurey}

This change reverts the following previous change:
This should help further troubleshoot flutter/flutter#154437

DEPS

@@ -277,7 +277,7 @@ allowed_hosts = [
 ]
 
 deps = {
-  'src': 'https://github.com/flutter/buildroot.git' + '@' + '773652167dbd506c5fb85d168e2c9038f24fed2a',
+  'src': 'https://github.com/flutter/buildroot.git' + '@' + 'f85c3be4bf808add6ba867b8ff7943fd235b7b5e',
 
   'src/flutter/third_party/depot_tools':
   Var('chromium_git') + '/chromium/tools/depot_tools.git' + '@' + '580b4ff3f5cd0dcaa2eacda28cefe0f45320e8f7',

lib/snapshot/BUILD.gn

@@ -63,9 +63,6 @@ group("generate_snapshot_bins") {
 # See: `bin_to_linkable` rules below that build these outputs into linkable form
 # See: https://github.com/flutter/flutter/wiki/Flutter-engine-operation-in-AOT-Mode
 compiled_action("generate_snapshot_bin") {
-  # TODO(https://github.com/flutter/flutter/issues/154437).
-  prefix_with_time_cmd = true
-
   if (target_cpu == "x86" && host_os == "linux") {
     # By default Dart will create a 32-bit gen_snapshot host binary if the target
     # platform is 32-bit.  Override this to create a 64-bit gen_snapshot for x86