Switch to equalIgnoringASCIICase throughout modules/accessibility

BUG=627682

Review-Url: https://codereview.chromium.org/2793913007
Cr-Commit-Position: refs/heads/master@{#461858}
std::unique_ptr<AXValue> createRoleNameValue(AccessibilityRole role) {
  AtomicString roleName = AXObject::roleName(role);
  std::unique_ptr<AXValue> roleNameValue;
  if (!roleName.isNull()) {
    roleNameValue = createValue(roleName, AXValueTypeEnum::Role);
  } else {
    roleNameValue = createValue(AXObject::internalRoleName(role),
                                AXValueTypeEnum::InternalRole);
  }
  return roleNameValue;
}

std::unique_ptr<AXValue> createRoleNameValue(AccessibilityRole role) {
  AtomicString roleName = AXObject::roleName(role);
  std::unique_ptr<AXValue> roleNameValue;
  if (!roleName.isNull()) {
    roleNameValue = createValue(roleName, AXValueTypeEnum::Role);
  } else {
    roleNameValue = createValue(AXObject::internalRoleName(role),
                                AXValueTypeEnum::InternalRole);
  }
  return roleNameValue;
}
