If current locale has "," as decimal separator then message for consoleAPICalled will be corrupted.

BUG=chromium:653424
R=dgozman@chromium.org

Committed: https://crrev.com/dde5ef75cbac1eb7e2dae59b246e4a0d0ba6a0f4
Review-Url: https://codereview.chromium.org/2410933002
Cr-Original-Commit-Position: refs/heads/master@{#40190}
Cr-Commit-Position: refs/heads/master@{#40288}