Switch to equalIgnoringASCIICase throughout modules/accessibility

BUG=627682

Review-Url: https://codereview.chromium.org/2793913007
Cr-Commit-Position: refs/heads/master@{#461858}
void AXNodeObject::init() {
#if DCHECK_IS_ON()
  ASSERT(!m_initialized);
  m_initialized = true;
#endif
  m_role = determineAccessibilityRole();
}

void AXNodeObject::init() {
#if DCHECK_IS_ON()
  ASSERT(!m_initialized);
  m_initialized = true;
#endif
  m_role = determineAccessibilityRole();
}
