[DevTools] Remove external device list update.

Source/devtools/front_end/main/Main.js

Index: Source/devtools/front_end/main/Main.js
diff --git a/Source/devtools/front_end/main/Main.js b/Source/devtools/front_end/main/Main.js
index 8aef2e370c7560d8b7bd3a0c84f6a6db028eb671..aa6403469ddc6c9d67e82a3f6bbd79c7e0cd7173 100644
--- a/Source/devtools/front_end/main/Main.js
+++ b/Source/devtools/front_end/main/Main.js
@@ -118,7 +118,6 @@ WebInspector.Main.prototype = {
         Runtime.experiments.register("blackboxJSFramesOnTimeline", "Blackbox JavaScript frames on Timeline");
         Runtime.experiments.register("timelineDetailsChart", "Costly functions view in Timeline details", true);
         Runtime.experiments.register("customObjectFormatters", "Custom object formatters", true);
-        Runtime.experiments.register("externalDeviceList", "External device list", true);
         Runtime.experiments.register("fileSystemInspection", "FileSystem inspection");
         Runtime.experiments.register("filmStripInNetworkAndTimeline", "Filmstrip in Network and Timeline Panel", true);
         Runtime.experiments.register("gpuTimeline", "GPU data on timeline", true);