Switch browser back to use Gpu upload path

Change-Id: I8dbc25b6c5bdf6b8edf4ba2273b886cc000bfaff

bug:5395019
diff --git a/res/xml/debug_preferences.xml b/res/xml/debug_preferences.xml
index abbd07e..ed78fcb 100644
--- a/res/xml/debug_preferences.xml
+++ b/res/xml/debug_preferences.xml
@@ -41,7 +41,7 @@
 
     <CheckBoxPreference
         android:key="enable_cpu_upload_path"
-        android:defaultValue="true"
+        android:defaultValue="false"
         android:title="@string/pref_development_cpu_upload_path" />
 
     <!-- The javascript console is enabled by default when the user has