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The message containing 'notification type' from
CheckNotificationTypeMatchesProtoMessageName is confusing since the source
of the error contains many similar strings.  Remind committers to refer to
the definition of the struct for more information.

New message:
'Error at lines 127-129 in model_type.cc: In the construction of ModelTypeInfo: notification type "WIFI_CREDENTIALIEA" does not match proto message name defined in sync.proto: "wifi_credentials"'

BUG=

Review-Url: https://codereview.chromium.org/2335413002
Cr-Commit-Position: refs/heads/master@{#419263}