Observe a flag to supress the HTTP auth dialog prompt and silently cancel auth.

Requires external/webkit change
If8c6f22e8307e1e13b8f7ad29f79305ce24b3255

Requires frameworks/base change:
Ida5708aad7cbe5633106e9ae2997c9231aaf95b8

Bug: 5094761
Change-Id: Id901855830bbe17ede8a18293cff2bbc0aad4ba8
diff --git a/src/com/android/browser/Controller.java b/src/com/android/browser/Controller.java
index 142375d..268c811 100644
--- a/src/com/android/browser/Controller.java
+++ b/src/com/android/browser/Controller.java
@@ -1000,7 +1000,7 @@
         if (username != null && password != null) {
             handler.proceed(username, password);
         } else {
-            if (tab.inForeground()) {
+            if (tab.inForeground() && !handler.suppressDialog()) {
                 mPageDialogsHandler.showHttpAuthentication(tab, handler, host, realm);
             } else {
                 handler.cancel();