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).

BUG=702438
TEST=gn check passes
CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.android:android_optional_gpu_tests_rel;master.tryserver.chromium.linux:linux_optional_gpu_tests_rel;master.tryserver.chromium.mac:mac_optional_gpu_tests_rel;master.tryserver.chromium.win:win_optional_gpu_tests_rel

Review-Url: https://codereview.chromium.org/2757463004
Cr-Commit-Position: refs/heads/master@{#458207}