Revert of DevTools: Add dark theme hidden experiment

third_party/WebKit/Source/devtools/front_end/main/Main.js

Index: third_party/WebKit/Source/devtools/front_end/main/Main.js
diff --git a/third_party/WebKit/Source/devtools/front_end/main/Main.js b/third_party/WebKit/Source/devtools/front_end/main/Main.js
index 92d133a10b7373fe7c1a1ba912c393af396c5014..1a9a6fb7781f0f282488d051176311b9bc50f182 100644
--- a/third_party/WebKit/Source/devtools/front_end/main/Main.js
+++ b/third_party/WebKit/Source/devtools/front_end/main/Main.js
@@ -107,7 +107,6 @@
         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("darkTheme", "Dark theme", true);
         Runtime.experiments.register("deviceMode", "Device mode", true);
         Runtime.experiments.register("emptySourceMapAutoStepping", "Empty sourcemap auto-stepping");
         Runtime.experiments.register("fileSystemInspection", "FileSystem inspection");
@@ -168,9 +167,6 @@
 
         WebInspector.initializeUIUtils(window);
         WebInspector.installComponentRootStyles(/** @type {!Element} */ (document.body));
-        if (Runtime.experiments.isEnabled("darkTheme")) {
-            document.body.classList.add("dark-theme");
-        }
 
         this._addMainEventListeners(document);