Stability file flushing: replace experiment by parameter

components/browser_watcher/features.h

Index: components/browser_watcher/features.h
diff --git a/components/browser_watcher/features.h b/components/browser_watcher/features.h
index 494881d11324f8ab4ce16a4f3d90f33b0658fd61..8f3503a6c3fbb13c4cec1bfd5fe18d96ba75a39b 100644
--- a/components/browser_watcher/features.h
+++ b/components/browser_watcher/features.h
@@ -9,8 +9,13 @@
 
 namespace browser_watcher {
 
+// Enables recording persistent stability information, which can later be
+// collected in the event of an unclean shutdown.
 extern const base::Feature kStabilityDebuggingFeature;
-extern const base::Feature kStabilityDebuggingFlushFeature;
+
+// Name of an experiment parameter that controls whether to perform an initial
+// flush.
+extern const char kInitFlushParam[];
 
 }  // namespace browser_watcher