When installing or upgrading to HDRP package version 7.1.2 type or namespace 'SerializedScalableSetting' can not be found. This prevents building or compiling the project.

1. Create a new project.
2. Download HDRP version 7.1.2 in the Package Manager. (Window -> Package Manager)

Expected outcome: The package installs with no errors.
Actual outcome: Errors in console. When you clear, three errors remain that prevent build and compilation.
(Error messages detailed below.)

Note:
- This also occurs when you upgrade an HDRP project to package version 7.1.2
- This was tested primarily on Mac but is reproducible on Windows.

Reproducible in 2019.3.0b9
Not reproducible in 2019.3.0b5, 2019.3.0b8, 2020.1.0a9

Errors shown in editor:
Library/PackageCache/com.unity.render-pipelines.high-definition@7.1.2/Editor/RenderPipeline/Settings/SerializedRenderPipelineSettings.cs(58,16): error CS0246: The type or namespace name 'SerializedScalableSetting' could not be found (are you missing a using directive or an assembly reference?)
Library/PackageCache/com.unity.render-pipelines.high-definition@7.1.2/Editor/RenderPipeline/Settings/SerializedRenderPipelineSettings.cs(59,16): error CS0246: The type or namespace name 'SerializedScalableSetting' could not be found (are you missing a using directive or an assembly reference?)
Library/PackageCache/com.unity.render-pipelines.high-definition@7.1.2/Editor/RenderPipeline/Settings/SerializedRenderPipelineSettings.cs(8,16): error CS0246: The type or namespace name 'SerializedScalableSetting' could not be found (are you missing a using directive or an assembly reference?)

License type: Pro