Android: Fix values to use standard type

"float" is not a values type, and since we only use this in java code
through R.*, we can safely switch to dimen as an actual type. Creates an
error in Android Studio otherwise.

BUG=620034

Review-Url: https://codereview.chromium.org/2680723004
Cr-Commit-Position: refs/heads/master@{#449055}
3 files changed