[Android] [iOS] Application.targetFrameRate doesn't work if 'V Sync Count' is set to 'Don't Sync' in the Quality Settings, but works when V Sync Count is set via script(QualitySettings.vSyncCount = 0;)

Steps to reproduce:

1) Download attached project 'VSyncBug.zip' and open in Unity
2) Make sure that V Sync Count is set to 'Don't Sync' in the QualitySettings
3) Build and Run 'ReproScene'
Observe the screen, and you will see that FPS of the application will be at 60

Expected result: FPS of the application should be at 45
Actual result: FPS of the application is at 60

Reproduced with:
5.5.4p1, 5.6.1p4, 2017.1.0b10, 2017.2.0a4

Devices under test:
Samsung SM G928F*, OS:7.0, CPU:arm64-v8a, GPU:Mali-T760, Build:samsung/zenltexx/zenlte:6.0.1/MMB29K/G928FXXS3BPIA:user/release-keys

Google Nexus 5*, OS:6.0.1, CPU:armeabi-v7a, GPU:Adreno (TM) 330, Build:google/hammerhead/hammerhead:6.0.1/MOB31E/3142026:user/release-keys

iPad Mini 3 iOS 9.3.5

Not reproduced with:
Standalone build, Editor

Workaround : Set V Sync Count via script(QualitySettings.vSyncCount = 0;)