Drop storage permission

app/src/main/java/com/hippo/ehviewer/ui/MainActivity.java

@@ -330,7 +330,6 @@ public final class MainActivity extends StageActivity
         }
 
         if (savedInstanceState == null) {
-            onInit();
             CommonOperations.checkUpdate(this, false);
             checkDownloadLocation();
             if (Settings.getCellularNetworkWarning()) {
@@ -362,12 +361,6 @@ public final class MainActivity extends StageActivity
         }
     }
 
-    private void onInit() {
-        // Check permission
-        PermissionRequester.request(this, Manifest.permission.WRITE_EXTERNAL_STORAGE,
-                getString(R.string.write_rationale), PERMISSION_REQUEST_WRITE_EXTERNAL_STORAGE);
-    }
-
     private void onRestore(Bundle savedInstanceState) {
         mNavCheckedItem = savedInstanceState.getInt(KEY_NAV_CHECKED_ITEM);
     }