Change parameter name to match the type

We change the names of the parameters to match the types, and to
match the names used in the definition of the function, to avoid
confusion.  Mostly notably, we no longer use "injectionSession"
for the first argument, which is not a CameraInjectionSession.

Test: TreeHugger
Bug: 196432585
Change-Id: I06315efc1257bfec763dd1fe45f7291921682a64