[Global] Update refs to Workspace.fileManager

Bug: 1006759
Change-Id: I24df39a057535819b4111bf30cf911b824800e0d
Reviewed-on: https://chromium-review.googlesource.com/c/devtools/devtools-frontend/+/2019122
Commit-Queue: Paul Lewis <aerotwist@chromium.org>
Reviewed-by: Tim van der Lippe <tvanderlippe@chromium.org>
diff --git a/front_end/audits/AuditsReportRenderer.js b/front_end/audits/AuditsReportRenderer.js
index 69e452c..d99dbf6 100644
--- a/front_end/audits/AuditsReportRenderer.js
+++ b/front_end/audits/AuditsReportRenderer.js
@@ -145,7 +145,7 @@
     const ext = blob.type.match('json') ? '.json' : '.html';
     const basename = `${sanitizedDomain}-${timestamp}${ext}`;
     const text = await blob.text();
-    Workspace.fileManager.save(basename, text, true /* forceSaveAs */);
+    self.Workspace.fileManager.save(basename, text, true /* forceSaveAs */);
   }
 
   async _print() {