Use WebViewFactory accessors to find experimental state

This allows the knowledge of default on/off state to the contained in
the WebViewFactory class.

Change-Id: I5645b403d6232252ef36e45097c6a76e4b693dd4
diff --git a/src/com/android/settings/DevelopmentSettings.java b/src/com/android/settings/DevelopmentSettings.java
index 6c3ce1a..a7ad1f7 100644
--- a/src/com/android/settings/DevelopmentSettings.java
+++ b/src/com/android/settings/DevelopmentSettings.java
@@ -1093,16 +1093,14 @@
 
     private void writeExperimentalWebViewOptions() {
         if (mExperimentalWebView != null) {
-            SystemProperties.set(WebViewFactory.WEBVIEW_EXPERIMENTAL_PROPERTY,
-                    mExperimentalWebView.isChecked() ? "true" : null);
+            WebViewFactory.setUseExperimentalWebView(mExperimentalWebView.isChecked());
             pokeSystemProperties();
         }
     }
 
     private void updateExperimentalWebViewOptions() {
         if (mExperimentalWebView != null) {
-            updateCheckBox(mExperimentalWebView, SystemProperties.getBoolean(
-                    WebViewFactory.WEBVIEW_EXPERIMENTAL_PROPERTY, false));
+            updateCheckBox(mExperimentalWebView, WebViewFactory.useExperimentalWebView());
         }
     }