This commit removes the mContext from IpSecBaseTest, and replaces it with InstrumentationRegistry.getContext(). Bug: 72950854 Test: Ran on devices, passing. Merged-In: If6fa359825aa9d1f7d4c8d49aba7a34925c073ed Change-Id: If6fa359825aa9d1f7d4c8d49aba7a34925c073ed (cherry picked from commit 69760fb5b62ae0e36c2a88bb20502dead3d7589b)