Changed Confirm sign-in dialog to modal.

chrome/android/java/src/org/chromium/chrome/browser/signin/ConfirmManagedSigninFragment.java

Index: chrome/android/java/src/org/chromium/chrome/browser/signin/ConfirmManagedSigninFragment.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/signin/ConfirmManagedSigninFragment.java b/chrome/android/java/src/org/chromium/chrome/browser/signin/ConfirmManagedSigninFragment.java
index 9070d23009bf6c48804c04e65234da5751b95199..9d74cea402820d22be9427bf66f2d1fc02e6fa08 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/signin/ConfirmManagedSigninFragment.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/signin/ConfirmManagedSigninFragment.java
@@ -29,6 +29,8 @@ public class ConfirmManagedSigninFragment extends DialogFragment {
 
     @Override
     public Dialog onCreateDialog(Bundle savedInstanceState) {
+        setCancelable(false);
+
         Activity activity = getActivity();
         AlertDialog.Builder builder = new AlertDialog.Builder(activity, R.style.AlertDialogTheme);
         builder.setTitle(R.string.policy_dialog_title);