[Flake] Clean up exonerating flaky tests input properties

This CL cleans up the experiments to give all the builders a clean
start before enabling the feature on by default, and the reason is that
it will be easier to compare the cycle time before and after to measure
the impact.

Bug: 838735
Change-Id: I7809eafa0d3294d90087e8dde4928a5e88704a64
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2036512Reviewed-by: Stephen Martinis <martiniss@chromium.org>
Commit-Queue: Yuke Liao <liaoyuke@chromium.org>
Cr-Commit-Position: refs/heads/master@{#737902}

infra/config/generated/cr-buildbucket.cfg

@@ -12022,7 +12022,6 @@ buckets: <
         cipd_version: "refs/heads/master"
         properties_j: "$build/chromium_tests:{\"bucketed_triggers\":true}"
         properties_j: "$build/goma:{\"enable_ats\":true,\"jobs\":150,\"rpc_extra_params\":\"?prod\",\"server_host\":\"goma.chromium.org\"}"
-        properties_j: "$build/test_utils:{\"should_exonerate_flaky_failures\":true}"
         properties_j: "$kitchen:{\"devshell\":true,\"git_auth\":true}"
         properties_j: "mastername:\"tryserver.chromium.android\""
       >
@@ -16459,7 +16458,6 @@ buckets: <
         properties_j: "$build/chromium_tests:{\"bucketed_triggers\":true}"
         properties_j: "$build/code_coverage:{\"use_clang_coverage\":true}"
         properties_j: "$build/goma:{\"enable_ats\":true,\"jobs\":150,\"rpc_extra_params\":\"?prod\",\"server_host\":\"goma.chromium.org\"}"
-        properties_j: "$build/test_utils:{\"should_exonerate_flaky_failures\":true}"
         properties_j: "$kitchen:{\"devshell\":true,\"git_auth\":true}"
         properties_j: "mastername:\"tryserver.chromium.linux\""
       >
@@ -17622,7 +17620,6 @@ buckets: <
         cipd_version: "refs/heads/master"
         properties_j: "$build/chromium_tests:{\"bucketed_triggers\":true}"
         properties_j: "$build/goma:{\"jobs\":150,\"rpc_extra_params\":\"?prod\",\"server_host\":\"goma.chromium.org\"}"
-        properties_j: "$build/test_utils:{\"should_exonerate_flaky_failures\":true}"
         properties_j: "$kitchen:{\"devshell\":true,\"git_auth\":true}"
         properties_j: "mastername:\"tryserver.chromium.mac\""
       >
@@ -18712,7 +18709,6 @@ buckets: <
         cipd_version: "refs/heads/master"
         properties_j: "$build/chromium_tests:{\"bucketed_triggers\":true}"
         properties_j: "$build/goma:{\"enable_ats\":true,\"jobs\":150,\"rpc_extra_params\":\"?prod\",\"server_host\":\"goma.chromium.org\"}"
-        properties_j: "$build/test_utils:{\"should_exonerate_flaky_failures\":true}"
         properties_j: "$kitchen:{\"devshell\":true,\"git_auth\":true}"
         properties_j: "mastername:\"tryserver.chromium.win\""
       >

infra/config/versioned/trunk/buckets/try.star

@@ -74,7 +74,6 @@ try_.chromium_android_builder(
     name = 'android-kitkat-arm-rel',
     goma_jobs = goma.jobs.J150,
     tryjob = try_.job(),
-    should_exonerate_flaky_failures = True,
 )
 
 try_.chromium_android_builder(
@@ -173,7 +172,6 @@ try_.chromium_linux_builder(
     goma_jobs = goma.jobs.J150,
     tryjob = try_.job(),
     use_clang_coverage = True,
-    should_exonerate_flaky_failures = True,
 )
 
 try_.chromium_linux_builder(
@@ -206,7 +204,6 @@ try_.chromium_mac_builder(
     name = 'mac-rel',
     goma_jobs = goma.jobs.J150,
     tryjob = try_.job(),
-    should_exonerate_flaky_failures = True,
 )
 
 try_.chromium_mac_builder(
@@ -243,5 +240,4 @@ try_.chromium_win_builder(
     os = os.WINDOWS_10,
     ssd = True,
     tryjob = try_.job(),
-    should_exonerate_flaky_failures = True,
 )