// DeletePolicy - deletes policy from storage and cache. When this called in
// response to a notification (i.e. isFromNotification = true), it skips the
// validation of policy usage and the attempt to delete in the backend as well
// (as this is already done by the notifying node).
func (store *IAMStoreSys) DeletePolicy(ctx context.Context, policy string, isFromNotification bool) error {
	if policy == "" {
		return errInvalidArgument
	}

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 * distributed under the License is distributed on an "AS IS" BASIS,
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 *
 * Unless required by applicable law or agreed to in writing, software
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 * Unless required by applicable law or agreed to in writing, software
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