DevTools: [CSS] remove CSS Regions experiment from DevTools.

Source/devtools/front_end/ElementsPanel.js

Index: Source/devtools/front_end/ElementsPanel.js
diff --git a/Source/devtools/front_end/ElementsPanel.js b/Source/devtools/front_end/ElementsPanel.js
index 0d5dc4636e4de1a15589d74ddc1ef7aba7125651..3168b56b3bc66bfe22eed79e5af21b21605280f2 100644
--- a/Source/devtools/front_end/ElementsPanel.js
+++ b/Source/devtools/front_end/ElementsPanel.js
@@ -28,8 +28,6 @@
  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
-importScript("CSSNamedFlowCollectionsView.js");
-importScript("CSSNamedFlowView.js");
 importScript("DOMSyntaxHighlighter.js");
 importScript("ElementsTreeOutline.js");
 importScript("EventListenersSidebarPane.js");
@@ -376,24 +374,12 @@ WebInspector.ElementsPanel.prototype = {
         var contextMenu = new WebInspector.ContextMenu(event);
         this.treeOutline.populateContextMenu(contextMenu, event);
 
-        if (WebInspector.experimentsSettings.cssRegions.isEnabled()) {
-            contextMenu.appendSeparator();
-            contextMenu.appendItem(WebInspector.UIString(WebInspector.useLowerCaseMenuTitles() ? "CSS named flows\u2026" : "CSS Named Flows\u2026"), this._showNamedFlowCollections.bind(this));
-        }
-
         contextMenu.appendSeparator();
         contextMenu.appendCheckboxItem(WebInspector.UIString(WebInspector.useLowerCaseMenuTitles() ? "Word wrap" : "Word Wrap"), toggleWordWrap.bind(this), WebInspector.settings.domWordWrap.get());
 
         contextMenu.show();
     },
 
-    _showNamedFlowCollections: function()
-    {
-        if (!WebInspector.cssNamedFlowCollectionsView)
-            WebInspector.cssNamedFlowCollectionsView = new WebInspector.CSSNamedFlowCollectionsView();
-        WebInspector.cssNamedFlowCollectionsView.showInDrawer();
-    },
-
     _domWordWrapSettingChanged: function(event)
     {
         if (event.data)