Use a single flag for enabling experimental WebKit features.

content/browser/web_contents/web_contents_impl.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "content/browser/web_contents/web_contents_impl.h"
 
 #include <utility>
 
 #include "base/command_line.h"
 #include "base/metrics/histogram.h"
@@ skipping 505 matching lines @@
   prefs.accelerated_layers_enabled =
       prefs.accelerated_animation_enabled =
           !command_line.HasSwitch(switches::kDisableAcceleratedLayers);
   prefs.accelerated_plugins_enabled =
       !command_line.HasSwitch(switches::kDisableAcceleratedPlugins);
   prefs.accelerated_video_enabled =
       !command_line.HasSwitch(switches::kDisableAcceleratedVideo);
   prefs.fullscreen_enabled =
       !command_line.HasSwitch(switches::kDisableFullScreen);
   prefs.css_regions_enabled =
-      command_line.HasSwitch(switches::kEnableCssRegions);
+      command_line.HasSwitch(switches::kEnableExperimentalWebKitFeatures);
   prefs.css_shaders_enabled =
       command_line.HasSwitch(switches::kEnableCssShaders);
   prefs.css_variables_enabled =
-      command_line.HasSwitch(switches::kEnableCssVariables);
+      command_line.HasSwitch(switches::kEnableExperimentalWebKitFeatures);
 #if defined(USE_AURA) && defined(USE_X11)
   prefs.device_supports_touch |=
       ui::TouchFactory::GetInstance()->IsTouchDevicePresent();
 #endif
 #if defined(OS_WIN)
   prefs.device_supports_touch = ui::IsTouchDevicePresent();
 #endif
 #if defined(OS_ANDROID)
   prefs.device_supports_mouse = false;
 #endif
@@ skipping 2746 matching lines @@
       old_browser_plugin_host()->embedder_render_process_host();
   *embedder_container_id = old_browser_plugin_host()->instance_id();
   int embedder_process_id =
       embedder_render_process_host ? embedder_render_process_host->GetID() : -1;
   if (embedder_process_id != -1) {
     *embedder_channel_name =
         StringPrintf("%d.r%d", render_view_host->GetProcess()->GetID(),
                      embedder_process_id);
   }
 }