HTMLMediaElement::createMediaControls should use AttachLazily
HTMLMediaElement::createMediaControls should use AttachLazily

The media element UI controls should be attached lazily.

TBR=eseidel

Review URL: https://chromiumcodereview.appspot.com/23224011

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@156349 bbb929c8-8fbe-4397-9dbb-9b2b20218538

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