Always initialize |m_totalWidth| in HarfBuzzShaper::shape.

R=leviw@chromium.org
BUG=476647

Review URL: https://codereview.chromium.org/1108663003

git-svn-id: svn://svn.chromium.org/blink/trunk@194541 bbb929c8-8fbe-4397-9dbb-9b2b20218538
void HarfBuzzShaper::setDrawRange(int from, int to)
{
    ASSERT_WITH_SECURITY_IMPLICATION(from >= 0);
    ASSERT_WITH_SECURITY_IMPLICATION(to <= m_run.length());
    m_fromIndex = from;
    m_toIndex = to;
}

void HarfBuzzShaper::setDrawRange(int from, int to)
{
    ASSERT_WITH_SECURITY_IMPLICATION(from >= 0);
    ASSERT_WITH_SECURITY_IMPLICATION(to <= m_run.length());
    m_fromIndex = from;
    m_toIndex = to;
}
