Restrict use of GN target //media/base/android:android

As //media/base/android:android is a source_set, multiple targets referencing
it using DEPS result in multiple copies of the code being used when
is_component_build = true. Adding a visibility restriction to the target,
and changing all users to use //media (which should be the only target
including the code).

TEST=gn check passes;master.tryserver.chromium.linux:linux_optional_gpu_tests_rel;master.tryserver.chromium.mac:mac_optional_gpu_tests_rel;

Cr-Commit-Position: refs/heads/master@{#458207}
9 files changed