Steps to reproduce:
1. Open the attached project
2. API updater should pop up. Do the API update.
3. Try building Scene "scene.unity" to any platform
4. Observe the error

Expected results: obsolete script gets fixed by Unity API updater on build.
Actual results: obsolete script located in "#else" bracket of "#if UNITY_EDITOR" preprocessor directive does not get updated, thus compile error is thrown.

Reproduced on: 5.4.5p1, 5.5.3p2, 5.6.1f1, 2017.1.0b4

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There are 2 different issues here:

1) APIUpdater taking Editor parameters for compilation (symbols, references, etc) regardless of which target is selected

2) Some members exist only in the Editor version of UnityEngine.dll causing updates to be skipped when the updater run during a player build.

We've fixed issue 1, meaning, that most code guarded by "#if !UNITY_EDITOR" as well code in the "else" branch of an "#if UNITY_EDITOR" will now be processed by the APIUpdater

Fixing 2 is not possible since it would require us to reintroduce these members which has a high potential of causing name clashes to a high number of developers; after considering the pros/cons of doing that we decided to not fix it. We apologize for the inconvenience.