Move ash/system/screen_security to Internals>Media>ScreenCapture

Bug: None
Change-Id: Ib1a2649b85bf832c09c0d1c4f164c10e61a3a651
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2387640Reviewed-by: Tetsui Ohkubo <tetsui@chromium.org>
Commit-Queue: Roman Sorokin [CET] <rsorokin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#805668}

ash/system/screen_security/DIR_METADATA

@@ -7,5 +7,5 @@
 #   https://source.chromium.org/chromium/infra/infra/+/master:go/src/infra/tools/dirmd/proto/dir_metadata.proto
 
 monorail {
-  component: "UI>Shell>LockScreen"
-}
+  component: "Internals>Media>ScreenCapture"
+}
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