Use a single flag for enabling experimental WebKit features.

content/renderer/render_thread_impl.cc

Index: content/renderer/render_thread_impl.cc
diff --git a/content/renderer/render_thread_impl.cc b/content/renderer/render_thread_impl.cc
index cc93798f9cb8eca2edc27630f69721c544700366..adc7b1627d092718355f5bc84e23a48665b5b2a1 100644
--- a/content/renderer/render_thread_impl.cc
+++ b/content/renderer/render_thread_impl.cc
@@ -700,13 +700,13 @@ void RenderThreadImpl::EnsureWebKitInitialized() {
   WebRuntimeFeatures::enableQuota(true);
 
   WebRuntimeFeatures::enableShadowDOM(
-      command_line.HasSwitch(switches::kEnableShadowDOM));
+      command_line.HasSwitch(switches::kEnableExperimentalWebKitFeatures));
 
   WebRuntimeFeatures::enableStyleScoped(
-      command_line.HasSwitch(switches::kEnableStyleScoped));
+      command_line.HasSwitch(switches::kEnableExperimentalWebKitFeatures));
 
   WebRuntimeFeatures::enableCSSExclusions(
-      command_line.HasSwitch(switches::kEnableCssExclusions));
+      command_line.HasSwitch(switches::kEnableExperimentalWebKitFeatures));
 
   FOR_EACH_OBSERVER(RenderProcessObserver, observers_, WebKitInitialized());