STYLE: Remove trailing whitespace

In addition to being poor style per se, trailing whitespace will trigger
a failure of Git's pre-commit style check. A user making new edits to a
file with existing style issues should not be forced to fix
these old issues too.

Change-Id: I53643e193e85e678d85571e0b09271bd9c69af74
Merge topic 'Remove-Trailing-Whitespace'

f1bf42c STYLE: Remove trailing whitespace