Fix a crash in the history publisher. This is caused by me changing the signature of ASCIIToWide to no longer take a string piece. This changed the behavior for NULL handling (NULL is no longer supported).
Fix a crash in the history publisher. This is caused by me changing the
signature of ASCIIToWide to no longer take a string piece. This changed the
behavior for NULL handling (NULL is no longer supported).

This change just doesn't do any conversion if the source is NULL.

BUG=51185
TEST=none

Review URL: http://codereview.chromium.org/2819090

git-svn-id: http://src.chromium.org/svn/trunk/src@54980 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: 66877de7a14c205a94d8b1fb01618ffb6a1862ca
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