Steps to reproduce:
1. Open either: example project from https://docs.unity3d.com/Manual/SparseTextures.html or QA-supplied project
2. Press Upgrade once prompted by the Script Updater
3. Once in the project, inspect the Console window and the script "MapTexture.cs"

Expected: No errors are thrown and all the lines are upgraded correctly
Actual: Unity throws some errors and inside the script 'renderer' is not changed to GetComponent<Renderer>()

Reproduced in: 2017.1.4f1, 2017.2.3p1, 2017.3.2f1, 2017.4.5f1, 2018.1.4.f1, 2018.2.0b7

Errors:
Assets/MapTexture.cs(94,12): error CS1061: Type `UnityEngine.Component' does not contain a definition for `sharedMaterial' and no extension method `sharedMaterial' of type `UnityEngine.Component' could be found. Are you missing an assembly reference?

Assets/MapTexture.cs(108,21): error CS1061: Type `UnityEngine.Component' does not contain a definition for `bounds' and no extension method `bounds' of type `UnityEngine.Component' could be found. Are you missing an assembly reference?

Assets/MapTexture.cs(122,12): error CS1061: Type `UnityEngine.Component' does not contain a definition for `sharedMaterial' and no extension method `sharedMaterial' of type `UnityEngine.Component' could be found. Are you missing an assembly reference?