The accuracy of WebView scale is less than density scale's one

The scale returned by getScale() is calculated as below;
- scale = (int)(100 * density)
- scale = scale/100.0f
So the scale is reduced its accuracy less than second decimal.
Therefore assertion should has delta 0.01f.

Change-Id: Ic5511e66a75d6e5dbc7dccec392b4a7e1b98e59b