DevTools: allow editing custom color palette, move it out of experimental.

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 453193154048008540ac4ef046f96af0225eef83..ed1907289f2c6d0bc36942b7a4a1bc8c27b89b6d 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("colorPalettes", "Color palettes");
         Runtime.experiments.register("customObjectFormatters", "Custom object formatters", true);
         Runtime.experiments.register("emptySourceMapAutoStepping", "Empty sourcemap auto-stepping");
         Runtime.experiments.register("fileSystemInspection", "FileSystem inspection");