[Global] Update refs to SDK.multitargetNetworkManager

Bug: 1006759
Change-Id: Id9152c0982e46484e0254ef9559bedad62e1bc6e
Reviewed-on: https://chromium-review.googlesource.com/c/devtools/devtools-frontend/+/2017146
Commit-Queue: Paul Lewis <[email protected]>
Reviewed-by: Tim van der Lippe <[email protected]>
diff --git a/front_end/network/BlockedURLsPane.js b/front_end/network/BlockedURLsPane.js
index 870fd5c..59fdae0 100644
--- a/front_end/network/BlockedURLsPane.js
+++ b/front_end/network/BlockedURLsPane.js
@@ -14,7 +14,7 @@
     this.registerRequiredCSS('network/blockedURLsPane.css');
 
     _instance = this;
-    this._manager = SDK.multitargetNetworkManager;
+    this._manager = self.SDK.multitargetNetworkManager;
     this._manager.addEventListener(SDK.MultitargetNetworkManager.Events.BlockedPatternsChanged, this._update, this);
 
     this._toolbar = new UI.Toolbar('', this.contentElement);