MSE: Modernize base::Bind usage for StreamParser callbacks

Since upcoming changeType() work will refactor some of the current code
that creates and passes callbacks to StreamParser::Init(), this CL
modernizes related base::Bind and base::Callback usage to either
base::Bind{Once,Repeating} and base::{Once,Repeating}Callback.

Note that the encrypted media init data callback is the same underlying
type in StreamParser as in Demuxer, so this CL also modernizes the
binding for the Demuxer version of that type.

base::Bind count in //media: before=1425, after=1384

BUG=714018,751838,605134

Cq-Include-Trybots: luci.chromium.try:android_optional_gpu_tests_rel;luci.chromium.try:linux_optional_gpu_tests_rel;luci.chromium.try:mac_optional_gpu_tests_rel;luci.chromium.try:win_optional_gpu_tests_rel
Change-Id: Ie8c3ef44a836c5bfa3f34ff300da760dd7f552c1
Reviewed-on: https://chromium-review.googlesource.com/1099935
Reviewed-by: Xiaohan Wang <xhwang@chromium.org>
Commit-Queue: Matthew Wolenetz <wolenetz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#567507}
25 files changed