Remove redundant scheduleDelayedAction in Audio constructor
Remove redundant scheduleDelayedAction in Audio constructor

Setting the src attribute will trigger HTMLMediaElement::parseAttribute,
which already calls scheduleDelayedAction when src is modified.

This is already tested by LayoutTests/media/audio-constructor-src.html

BUG=none

Review URL: https://codereview.chromium.org/36863002

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@160333 bbb929c8-8fbe-4397-9dbb-9b2b20218538

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