Use UTF8ToUTF16 in ChromeBreakpadClient.

Prevents a DCHECK, as the text is UTF-8, not ASCII.

BUG=316340
TEST="Chrome has crashed!" dialog itself doesn't crash on --lang=he Debug builds.
R=cpu@chromium.org

Review URL: https://codereview.chromium.org/65563002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@234158 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 234158