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This CL partially reverts r242570 and r243346.

The functionality added in those patches has been removed while some refactoring part
has been kept because those make sense and also because some code came later would have
to be moved otherwise.

The suspend/resume fullscreen video logic does not work well when the browser
activity is destroyed when it is in the background. Unfortunately I could not
find a way to make it work for that case yet so it's better remove it.

BUG=323697

Review URL: https://codereview.chromium.org/157783004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@251455 0039d316-1c4b-4281-b951-d872f2087c98