Update the Webkit version.

Fix http://b/issue?id=2571957
diff --git a/core/res/res/values/strings.xml b/core/res/res/values/strings.xml
index bf7425f..48d1ad7 100644
--- a/core/res/res/values/strings.xml
+++ b/core/res/res/values/strings.xml
@@ -1612,8 +1612,8 @@
     <string name="factorytest_reboot">Reboot</string>
 
     <!-- Do not translate.  WebView User Agent string -->
-    <string name="web_user_agent"><xliff:g id="x">Mozilla/5.0 (Linux; U; Android %s)
-        AppleWebKit/530.17 (KHTML, like Gecko) Version/4.0 Mobile Safari/530.17</xliff:g></string>
+    <string name="web_user_agent" translatable="false"><xliff:g id="x">Mozilla/5.0 (Linux; U; Android %s)
+        AppleWebKit/533.1 (KHTML, like Gecko) Version/4.0 Mobile Safari/533.1</xliff:g></string>
 
     <!-- Title for a JavaScript dialog. "The page at <url of current page> says:" -->
     <string name="js_dialog_title">The page at \'<xliff:g id="title">%s</xliff:g>\' says:</string>