Remove all "flaky" annotations from devicelab (#21895)
These tests don't seem particularly more flaky than ony others any more.
diff --git a/dev/devicelab/manifest.yaml b/dev/devicelab/manifest.yaml
index 8ffc13f..793421d 100644
--- a/dev/devicelab/manifest.yaml
+++ b/dev/devicelab/manifest.yaml
@@ -141,7 +141,6 @@
Tests that the Android accessibility bridge produces correct semantics.
stage: devicelab
required_agent_capabilities: ["mac/android"]
- flaky: true
run_release_test:
description: >
@@ -277,7 +276,6 @@
test can run on off-the-shelf infrastructures, such as Firebase Test Lab.
stage: devicelab
required_agent_capabilities: ["linux/android"]
- flaky: true
flutter_attach_test:
description: >
@@ -451,7 +449,6 @@
Android.
stage: devicelab
required_agent_capabilities: ["linux/android"]
- flaky: true
flutter_gallery__transition_perf_with_semantics:
description: >
@@ -459,14 +456,12 @@
with semantics enabled.
stage: devicelab
required_agent_capabilities: ["linux/android"]
- flaky: true
flutter_gallery__memory_nav:
description: >
Measures memory usage after repeated navigation in Gallery.
stage: devicelab
required_agent_capabilities: ["linux/android"]
- flaky: true
flutter_gallery__back_button_memory:
description: >