Merge WebKit at r78450: Update useragent string

Change-Id: I4d597a8709e9188c083e73a133a12d3121204e6f
diff --git a/core/res/res/values/strings.xml b/core/res/res/values/strings.xml
index 158d524..0323eb5 100755
--- a/core/res/res/values/strings.xml
+++ b/core/res/res/values/strings.xml
@@ -1852,7 +1852,7 @@
 
     <!-- Do not translate.  WebView User Agent string -->
     <string name="web_user_agent" translatable="false">Mozilla/5.0 (Linux; U; <xliff:g id="x">Android %s</xliff:g>)
-        AppleWebKit/534.16 (KHTML, like Gecko) Version/4.0 <xliff:g id="mobile">%s</xliff:g>Safari/534.16</string>
+        AppleWebKit/534.20 (KHTML, like Gecko) Version/4.0 <xliff:g id="mobile">%s</xliff:g>Safari/534.20</string>
     <!-- Do not translate.  WebView User Agent targeted content -->
     <string name="web_user_agent_target_content" translatable="false">"Mobile "</string>