Use Siso instead of Ninja

Required acording to http://b/414724525#comment5

Bug: 422043956
Change-Id: Ibf4aa3460004c89a0b0a6ad67422ee76911278c1
Reviewed-on: https://chromium-review.googlesource.com/c/devtools/devtools-frontend/+/6679492
Auto-Submit: Liviu Rau <[email protected]>
Reviewed-by: Simon Zünd <[email protected]>
Commit-Queue: Simon Zünd <[email protected]>

Author: Liviu Rau

.gn

@@ -18,4 +18,6 @@ check_targets = [ "*" ]
 script_executable = "python3"
 
 default_args = {
+  # Use Siso instead of Ninja.
+  use_siso = true
 }