[ced] Suppress a compiler warning on Windows

Added a new option suppressing MSVC compiler warning:

'<': signed/unsigned mismatch

for the places where a signed int is used for a loop variable
against unsigned int upper limit. This is necessary for Windows build.

BUG=597488

Review-Url: https://codereview.chromium.org/2092533003
Cr-Commit-Position: refs/heads/master@{#401492}
1 file changed