AI 148257: Allow preview of any files (mime type */*) by removing

the original filters.  This affects preview, not download.
  This does not preflight the launch at all, it is very simple
  as it simply downloads the attachment and then tries to open it.
  If no activity is found, it uses a toast to say "couldn't do
  that."  A better fix will be to pre-check the mime type to see
  if there are any intent filters to handle it.
  BUG=1650669

Automated import of CL 148257

src/com/android/email/Email.java

@@ -64,9 +64,7 @@ public class Email extends Application {
      * The MIME type(s) of attachments we're willing to view.
      */
     public static final String[] ACCEPTABLE_ATTACHMENT_VIEW_TYPES = new String[] {
-        "image/*",
-        "audio/*",
-        "text/*",
+        "*/*",
     };
 
     /**