Otherwise, the files are opened in 'whatever happens to be the current encoding'
which is highly system-dependent. Even if some files are not encoded with utf-8,
the status quo is even worse. So it's worth trying out.

TBR=cmp@chromium.org
BUG=
TEST=


Review URL: https://chromiumcodereview.appspot.com/10697036

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@145306 0039d316-1c4b-4281-b951-d872f2087c98