DevTools: Move timeline tree view out of experiment

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 8cc2be0a09faef260b4479363e61aef4c23dfd37..228ea5e24fabb6c6e4f13ac77a6caad1ee224f96 100644
--- a/Source/devtools/front_end/main/Main.js
+++ b/Source/devtools/front_end/main/Main.js
@@ -126,7 +126,6 @@ WebInspector.Main.prototype = {
         Runtime.experiments.register("applyCustomStylesheet", "Allow custom UI themes");
         Runtime.experiments.register("blackboxJSFramesOnTimeline", "Blackbox JavaScript frames on Timeline", true);
         Runtime.experiments.register("colorContrastRatio", "Contrast ratio line in color picker", true);
-        Runtime.experiments.register("timelineTreeView", "Costly functions tree view on the Timeline", true);
         Runtime.experiments.register("colorPalettes", "Color palettes");
         Runtime.experiments.register("customObjectFormatters", "Custom object formatters", true);
         Runtime.experiments.register("emptySourceMapAutoStepping", "Empty sourcemap auto-stepping");