mash: Move directly linked NewWindowDelegate to mojom::NewWindowClient.

chrome/app/mash/chrome_mash_content_browser_manifest_overlay.json

Index: chrome/app/mash/chrome_mash_content_browser_manifest_overlay.json
diff --git a/chrome/app/mash/chrome_mash_content_browser_manifest_overlay.json b/chrome/app/mash/chrome_mash_content_browser_manifest_overlay.json
index 9045edfa194e571d1b7cf0587dea03b9d7ffc46a..67a4b3e823fea7c1cf71550e5a1a7b23bc84d3c0 100644
--- a/chrome/app/mash/chrome_mash_content_browser_manifest_overlay.json
+++ b/chrome/app/mash/chrome_mash_content_browser_manifest_overlay.json
@@ -10,6 +10,7 @@
     "service_manager:connector": {
       "provides": {
         "content_browser:ash": [
+          "ash::mojom::NewWindowClient",
           "ash::mojom::SystemTrayClient",
           "ash::mojom::VolumeController",
           "ash::mojom::WallpaperManager",
@@ -20,7 +21,8 @@
       "requires": {
         "service:ash": [ "ash" ],
         "service:accessibility_autoclick": [ "ash:autoclick" ],
-        "service:mash_session": [ "app" ]
+        "service:mash_session": [ "app" ],
+        "service:task_viewer": [ "mash:launchable" ]
       }
     }
   }