Persist network panel resource type filter.

Source/devtools/front_end/Settings.js

Index: Source/devtools/front_end/Settings.js
diff --git a/Source/devtools/front_end/Settings.js b/Source/devtools/front_end/Settings.js
index 632108198c5890bf1d49a78829d0cfc4c09905c9..7d9cbae3a8c3a0aaee2176ca9c73e9578cd8122a 100644
--- a/Source/devtools/front_end/Settings.js
+++ b/Source/devtools/front_end/Settings.js
@@ -100,6 +100,7 @@ WebInspector.Settings = function()
     this.workerInspectorHeight = this.createSetting("workerInspectorHeight", 600);
     this.messageURLFilters = this.createSetting("messageURLFilters", {});
     this.networkHideDataURL = this.createSetting("networkHideDataURL", false);
+    this.networkResourceTypeFilters = this.createSetting("networkResourceTypeFilters", {});
     this.messageLevelFilters = this.createSetting("messageLevelFilters", {});
     this.splitVerticallyWhenDockedToRight = this.createSetting("splitVerticallyWhenDockedToRight", true);
     this.visiblePanels = this.createSetting("visiblePanels", {});