Fixing font size in beta

We have to use !important on the font-size of the html element
since the html element cannot be targeted to stable or beta (as it
is outside the body element). Thus we have to override the rule in
typography.less.

Bug: 61291
Change-Id: I6c52e55729bc2c1eedf00ddb6d2c4a39414e5148
Merge "Fixing font size in beta"