CrOS GMC: change dialog title to "Media controls".

Bug: 1142880
Change-Id: I7e637b83bf15f6957782eb6348b87761bfe85296
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2503314Reviewed-by: Tetsui Ohkubo <tetsui@chromium.org>
Commit-Queue: Jazz Xu <jazzhsu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#821664}

ash/ash_strings.grd

@@ -2593,7 +2593,7 @@ This file contains the strings for ash.
       </message>
 
       <message name="IDS_ASH_GLOBAL_MEDIA_CONTROLS_TITLE" desc="The label used as global media controls' title.">
-        Media Controls
+        Media controls
       </message>
 
       <message name="IDS_ASH_GLOBAL_MEDIA_CONTROLS_PINNED_BUTTON_TOOLTIP_TEXT" desc="Tooltip for pinned button showing in global media controls' title.">

ash/ash_strings_grd/IDS_ASH_GLOBAL_MEDIA_CONTROLS_TITLE.png.sha1

-819afa95349787705b722fc6ce7176998c5a1743
\ No newline at end of file
+f9a8216d8e900c9aa195e98c1acea509d194a907
\ No newline at end of file