Scan on code base and found those API are not be used
anymore, and IWindowSession only be used in frameworks. Should be
able to remove them if needed.
Bug:111361793
Test: atest CtsWindowManagerDeviceTestCases
Test: atest CtsActivityManagerDeviceTestCases
Change-Id: Idbf680ae68d21e055d9ccfa33aea4a73891ddd14