Fix BridgecontextTest.noExceptionForCustomService

Remove the expected warning logged when calling Context.getSystemService
on a custom service.

Bug: N/A
Test: N/A
Change-Id: I9b1746dc8f24976d5cead222ae6cdfc6326b99bd
(cherry picked from commit 8243f598aa48d56a039ec8a0a7183a2830a608f3)