Change status of runtime flag CaptureTimeInCsrc to stable.

Bug: 1056230

Change-Id: I7cc0529eaa2e476192d62637fb70e6542920021a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2126291Reviewed-by: Henrik Boström <hbos@chromium.org>
Reviewed-by: Xianzhu Wang <wangxianzhu@chromium.org>
Commit-Queue: Minyue Li <minyue@chromium.org>
Cr-Commit-Position: refs/heads/master@{#756966}

third_party/blink/renderer/platform/runtime_enabled_features.json5

@@ -294,7 +294,7 @@
     },
     {
       name: "CaptureTimeInCsrc",
-      status: "test",
+      status: "stable",
     },
     {
       name: "ClickPointerEvent",