Roll DevTools to version 2.7.0

Change-Id: Ib98f2396be310a176cb0c4861cdfcd01320c323a
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/215520
Reviewed-by: Kenzie Schmoll <kenzieschmoll@google.com>
diff --git a/DEPS b/DEPS
index 7bb539d..bbeda37f 100644
--- a/DEPS
+++ b/DEPS
@@ -107,7 +107,7 @@
   "dart_style_rev": "14d9b6fd58cc4744676c12be3cc5eee2a779db82",
 
   "dartdoc_rev" : "c2f284f09bcc49025fe26e86b2d45e1b546f81a3",
-  "devtools_rev" : "2b47d9ed486479153ca2fd038000950674ed1beb",
+  "devtools_rev" : "8881a7caa9067471008a8e00750b161f53cdb843",
   "jsshell_tag": "version:88.0",
   "ffi_rev": "4dd32429880a57b64edaf54c9d5af8a9fa9a4ffb",
   "fixnum_rev": "16d3890c6dc82ca629659da1934e412292508bba",