Do not use wide reads in CopyCharsUnsigned.
Do not use wide reads in CopyCharsUnsigned.

R=jkummerow@chromium.org
BUG=chromium:412967
LOG=Y

Review URL: https://codereview.chromium.org/566583002

git-svn-id: f98b9d40cb02301bc76fa9e1b46ee668158567fd@23876 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

UniversalFuture/moosh,UniversalFuture/moosh,UniversalFuture/moosh,UniversalFuture/moosh