When creating a material and then overriding the textures on the new material instance, the unused textures are still included in the cooking process.

Steps to Reproduce

1. Create a blank project with starter content
2. Create a material instance from a material
3. Override the texture within the material instance
4. Save the project
5. Cook the project and review the logs

Expected: The unused materials shouldn't appear within the cooking logs.
Results: The unused material is in the cooking logs, along with the updated texture for the material instance.

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By Design
ComponentUE - Foundation - Core
Affects Versions4.9.1
Target Fix4.11
CreatedSep 28, 2015
ResolvedSep 29, 2015
UpdatedFeb 5, 2017
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