Revert "Make internal.*.webrtc iOS bots dimensions depend on bot_id and pool only"

This reverts commit 9a27c2fc7a2eb068eb06fad2e991039e2fceb960.

Reason for revert: device_type and os version is mandatory
for correct step naming

Original change's description:
> Make internal.*.webrtc iOS bots dimensions depend on bot_id and pool only
> 
> Bug: webrtc:10047
> Change-Id: I48bcc15721859062c73c7e5fbae7a2fd65713adc
> Reviewed-on: https://webrtc-review.googlesource.com/c/120615
> Reviewed-by: Oleh Prypin <oprypin@webrtc.org>
> Commit-Queue: Artem Titarenko <artit@webrtc.org>
> Cr-Commit-Position: refs/heads/master@{#26485}

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

Change-Id: I511eec8e8c24e82881be06ca0ca7b7038971db94
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: webrtc:10047
Reviewed-on: https://webrtc-review.googlesource.com/c/120802
Reviewed-by: Artem Titarenko <artit@webrtc.org>
Commit-Queue: Artem Titarenko <artit@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#26492}
diff --git a/tools_webrtc/ios/internal.client.webrtc/iOS64_Perf.json b/tools_webrtc/ios/internal.client.webrtc/iOS64_Perf.json
index a0d97ac..14cb114 100644
--- a/tools_webrtc/ios/internal.client.webrtc/iOS64_Perf.json
+++ b/tools_webrtc/ios/internal.client.webrtc/iOS64_Perf.json
@@ -19,8 +19,8 @@
   "tests": [
     {
       "include": "perf_tests.json",
-      "bot id": "build15-a7",
-      "pool": "WebRTC",
+      "device type": "iPhone 7",
+      "os": "11.0.3",
       "max runtime seconds": 7200
     }
   ]
diff --git a/tools_webrtc/ios/internal.tryserver.webrtc/ios_arm64_perf.json b/tools_webrtc/ios/internal.tryserver.webrtc/ios_arm64_perf.json
index e1f5632..e7b9743 100644
--- a/tools_webrtc/ios/internal.tryserver.webrtc/ios_arm64_perf.json
+++ b/tools_webrtc/ios/internal.tryserver.webrtc/ios_arm64_perf.json
@@ -18,9 +18,9 @@
   "bucket": "chromium-webrtc",
   "tests": [
     {
-      "include": "perf_tests.json",
-      "bot id": "build16-a7",
-      "pool": "WebRTC",
+      "include": "perf_trybot_tests.json",
+      "device type": "iPhone 7",
+      "os": "11.0.3",
       "max runtime seconds": 7200
     }
   ]
diff --git a/tools_webrtc/ios/tests/perf_tests.json b/tools_webrtc/ios/tests/perf_tests.json
index 05a34be..a249b98 100644
--- a/tools_webrtc/ios/tests/perf_tests.json
+++ b/tools_webrtc/ios/tests/perf_tests.json
@@ -4,7 +4,9 @@
       "app": "webrtc_perf_tests",
       "test args": [
         "--save_chartjson_result"
-      ]
+      ],
+      "bot id": "build15-a7",
+      "pool": "WebRTC"
     }
   ]
 }
diff --git a/tools_webrtc/ios/tests/perf_trybot_tests.json b/tools_webrtc/ios/tests/perf_trybot_tests.json
new file mode 100644
index 0000000..02a792a
--- /dev/null
+++ b/tools_webrtc/ios/tests/perf_trybot_tests.json
@@ -0,0 +1,12 @@
+{
+  "tests": [
+    {
+      "app": "webrtc_perf_tests",
+      "test args": [
+        "--save_chartjson_result"
+      ],
+      "bot id": "build16-a7",
+      "pool": "WebRTC"
+    }
+  ]
+}