Only allow mappings for ICU initialization. (#8656)
If the mapping callback is not set or it the callback returns invalid data, ICU initialization will be embedder responsibility. This affects all embedders and the following have been audited: * Android: Via a symbol mapping. * iOS: Via a file mapping. * Embedder: Via a file mapping. * Fuchsia: Via a VMO mapping * Test shells and Flutter tester: Via file mapping with ICU data needing to be next to the executable.
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