fix broken build

change 'char' to 'int8_t'

BUG=skia:

NOTRY=true
TBR=reed@google.com

Author: caryclark@google.com

Review URL: https://codereview.chromium.org/237263004

git-svn-id: http://skia.googlecode.com/svn/trunk@14186 2bbb7eff-a529-9590-31e7-b0007b416f81
1 file changed