tree 4b93bf0e95fdc73ea46ef66408e1235a0b0e4089
parent 0c2d4d6f2cd68f90d187b5df5f75ec42adaa4eb2
author Hall Liu <hallliu@google.com> 1536972161 -0700
committer Hall Liu <hallliu@google.com> 1537315860 +0000

Cleanup and refactor IMS hold logic

Use special case method calls for holding IMS calls due to the
fundamentally different behavior

Also remove implementations of some old APIs.

Bug: 115943523
Bug: 75608720
Test: unit, manual
Change-Id: Id618f8728f642d6c3af66775859c0f7b90e9ba9c