Remove some unused import lines within source code based on https://source.android.com/setup/contribute/code-style Bug: 182867979 Test: build pass Change-Id: I76dbcfa9e5b435b2838401dfee15b12f472d07d0
Wrap IMS related APIs in order to support replacing ImsManager. Bug: 140542283 Test: build pass Merged-In: I10aff50b6f3fc50b2f336ee320740f9f4a81e256 Change-Id: Ibc8c1c36fe031a3d845b99f878ef45ce5db7de28