Remove junit4 dependency from test

This module uses build rule BUILD_CTSCORE_PACKAGE, which
automatically puts android.test.runner (with junit4 built-in) on
classpath during compilation. At runtime, this dependency is also
satisfied by android.test.runner.

Bug: 26458139
Change-Id: I6e49eb046ffe9451eb03319a352ebfa377d4fe3f
1 file changed