[iOS] Add expiration time to tests running on iPhone7 device

Based on limited iPhone7 device swarming pool capacity, we need to
increase tasks expiration time to 1 hour.

Bug: chromium:774381
No-Try: true
Change-Id: I66da6c2d5b03ba8c52eead5260b3c244f1df7894
Reviewed-on: https://webrtc-review.googlesource.com/23003
Reviewed-by: Patrik Höglund <phoglund@webrtc.org>
Reviewed-by: Edward Lemur <ehmaldonado@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#20692}
diff --git a/tools_webrtc/ios/internal.client.webrtc/iOS64_Release.json b/tools_webrtc/ios/internal.client.webrtc/iOS64_Release.json
index 54516e8..3348039 100644
--- a/tools_webrtc/ios/internal.client.webrtc/iOS64_Release.json
+++ b/tools_webrtc/ios/internal.client.webrtc/iOS64_Release.json
@@ -25,5 +25,6 @@
       "device type": "iPhone 7",
       "os": "11.0"
     }
-  ]
+  ],
+  "expiration_time": 3600
 }
diff --git a/tools_webrtc/ios/internal.tryserver.webrtc/ios_arm64_rel.json b/tools_webrtc/ios/internal.tryserver.webrtc/ios_arm64_rel.json
index 54516e8..3348039 100644
--- a/tools_webrtc/ios/internal.tryserver.webrtc/ios_arm64_rel.json
+++ b/tools_webrtc/ios/internal.tryserver.webrtc/ios_arm64_rel.json
@@ -25,5 +25,6 @@
       "device type": "iPhone 7",
       "os": "11.0"
     }
-  ]
+  ],
+  "expiration_time": 3600
 }