DLP: Update screen capture stopped message.

See mocks (go/cros-dlp) and strings:
https://docs.google.com/document/d/1fqzX-QYidDKijMpPd8kaoFwg1zHAIGB7laD4tIBPzSk/edit

Bug: 1133324
Change-Id: I44aa6396aeaabfdbf8ccef9a278e0c3c19c83109
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2522081
Auto-Submit: Sergey Poromov <poromov@chromium.org>
Commit-Queue: Ahmed Fakhry <afakhry@chromium.org>
Reviewed-by: Ahmed Fakhry <afakhry@chromium.org>
Cr-Commit-Position: refs/heads/master@{#825146}

ash/ash_strings.grd

@@ -3035,7 +3035,7 @@ Here are some things you can try to get started.
         Failed to capture screen
       </message>
       <message name="IDS_ASH_SCREEN_CAPTURE_STOPPED_MESSAGE" desc="The text of the notification when video capture is stopped.">
-        Screen recording stopped due to confidential content on your screen.
+        Screen recording has been stopped by your administrator due to content on your screen.
       </message>
       <message name="IDS_ASH_SCREEN_CAPTURE_DISPLAY_SOURCE" desc="The name that is the display source of the screen capture notification.">
         Screen capture

ash/ash_strings_grd/IDS_ASH_SCREEN_CAPTURE_STOPPED_MESSAGE.png.sha1

-feb4ffe52e5331898d157388837de87b11285126
\ No newline at end of file
+83dac7d6dce657136744cefe144249ca1460940a
\ No newline at end of file