Move //{chromeos/components => ash/webui}/diagnostics_ui

This CL is part of the Chrome OS source code directory migration:
https://docs.google.com/document/d/1g-98HpzA8XcoGBWUv1gQNr4rbnD5yfvbtYZyPDDbkaE.

Change-Id: I4c7dc302e958e2b2b88b07141658a8085dc905aa
Bug: 1164001
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2992405
Commit-Queue: Yeunjoo Choi <[email protected]>
Reviewed-by: Hidehiko Abe <[email protected]>
Reviewed-by: Joon Ahn <[email protected]>
Owners-Override: Hidehiko Abe <[email protected]>
Cr-Commit-Position: refs/heads/master@{#898020}
diff --git a/WATCHLISTS b/WATCHLISTS
index 10ba7faf..07efac0 100644
--- a/WATCHLISTS
+++ b/WATCHLISTS
@@ -922,7 +922,7 @@
       'filepath': 'devtools',
     },
     'diagnostics_ui': {
-      'filepath': 'chromeos/components/diagnostics_ui/',
+      'filepath': 'ash/webui/diagnostics_ui/',
     },
     'discardable_memory': {
         'filepath': 'components/discardable_memory/',