Revert "//tools/perf: Use trigger script in OBBS tester"

This reverts commit 1d3fc0ad.

Reason for revert: Broken for now, will reland with some fixes. ashleymarie@ might do the reland.

Original change's description:
> //tools/perf: Use trigger script in OBBS tester
> 
> Change-Id: Ie024ff5713fde047803601391629caff3f40950b
> Reviewed-on: https://chromium-review.googlesource.com/722067
> Commit-Queue: Stephen Martinis <martiniss@chromium.org>
> Reviewed-by: Ned Nguyen <nednguyen@google.com>
> Cr-Commit-Position: refs/heads/master@{#510581}

TBR=nednguyen@google.com,martiniss@chromium.org,eyaich@chromium.org,ashleymarie@chromium.org

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

Change-Id: I4de924b07b2420e6a9f1fba6095e993292354595
Reviewed-on: https://chromium-review.googlesource.com/734990Reviewed-by: Stephen Martinis <martiniss@chromium.org>
Commit-Queue: Stephen Martinis <martiniss@chromium.org>
Cr-Commit-Position: refs/heads/master@{#512597}

testing/buildbot/chromium.perf.fyi.json

@@ -83,6 +83,8 @@
     "isolated_scripts": [
       {
         "args": [
+          "--bot",
+          "swarm823-c4",
           "--builder",
           "One Buildbot Step Test Builder",
           "-v",
@@ -100,6 +102,7 @@
           "can_use_on_swarming_builders": true,
           "dimension_sets": [
             {
+              "id": "swarm823-c4",
               "pool": "Chrome-perf-fyi"
             }
           ],
@@ -107,17 +110,6 @@
           "hard_timeout": 10800,
           "ignore_task_failure": false,
           "io_timeout": 3600
-        },
-        "trigger_script": {
-          "args": [
-            "--bot-id",
-            "swarm823-c4",
-            "--bot-id",
-            "swarm846-c4",
-            "--bot-id",
-            "swarm847-c4"
-          ],
-          "script": "//tools/perf/perf_device_trigger.py"
         }
       }
     ]

tools/perf/chromium.perf.fyi.extras.json

@@ -85,6 +85,7 @@
     "isolated_scripts": [
       {
         "args": [
+          "--bot", "swarm823-c4",
           "--builder", "One Buildbot Step Test Builder",
           "-v",
           "--output-format=histograms",
@@ -101,6 +102,7 @@
           "can_use_on_swarming_builders": true,
           "dimension_sets": [
             {
+              "id": "swarm823-c4",
               "pool": "Chrome-perf-fyi"
             }
           ],
@@ -108,14 +110,6 @@
           "hard_timeout": 10800,
           "ignore_task_failure": false,
           "io_timeout": 3600
-        },
-        "trigger_script": {
-          "script": "//tools/perf/perf_device_trigger.py",
-          "args": [
-            "--bot-id", "swarm823-c4",
-            "--bot-id", "swarm846-c4",
-            "--bot-id", "swarm847-c4"
-          ]
         }
       }
     ]