Mark non-flaky test as such (flutter#58112)

liyuqian · web-flow · commit 0cca3c1d6209 · 2020-05-28T15:40:12.000-07:00
diff --git a/dev/devicelab/manifest.yaml b/dev/devicelab/manifest.yaml
@@ -290,7 +290,6 @@ tasks:
       Measures memory usage of the scroll performance test using DevTools.
     stage: devicelab
     required_agent_capabilities: ["linux/android"]
-    flaky: true
 
   hello_world_android__compile:
     description: >
