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: http://src.chromium.org/svn/trunk/src@51018 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: cedceea313dc310c4403c741ecf61651de0958c4
meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser