remoting: Use GetBytesPerPixel util function in one more place.
remoting: Use GetBytesPerPixel util function in one more place.

Note: This fix another TODO for hclam, missed in the other patch.

BUG=None
TEST=trybots

Review URL: http://codereview.chromium.org/2863028

git-svn-id: dd90618784b6a4b323ea0c23a071cb1c9e6f2ac7@51018 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser