fix to run Webview Policy initialization on the UI thread

components/policy/android/java/src/org/chromium/policy/AbstractAppRestrictionsProvider.java

Index: components/policy/android/java/src/org/chromium/policy/AbstractAppRestrictionsProvider.java
diff --git a/components/policy/android/java/src/org/chromium/policy/AbstractAppRestrictionsProvider.java b/components/policy/android/java/src/org/chromium/policy/AbstractAppRestrictionsProvider.java
index 3fc27327530627d127db420cc5baad5299fa57a8..bf77ebfa1003273a6055fb90e7392d80e3f19158 100644
--- a/components/policy/android/java/src/org/chromium/policy/AbstractAppRestrictionsProvider.java
+++ b/components/policy/android/java/src/org/chromium/policy/AbstractAppRestrictionsProvider.java
@@ -85,7 +85,12 @@ public void startListeningForPolicyChanges() {
     public void refresh() {
         final Bundle cachedResult = getCachedPolicies();
         if (cachedResult != null) {
-            notifySettingsAvailable(cachedResult);
+            ThreadUtils.runOnUiThread(new Runnable() {
+                @Override
+                public void run() {
+                    notifySettingsAvailable(cachedResult);
+                }
+            });
         }
 
         mExecutor.execute(new Runnable() {