Use isFinishedParsingChildren() in HTMLMediaElement

Remove HTMLMediaElement::m_parsingInProgress.

There is no runtime change, as isFinishedParsingChildren() is true per
default, even for script-created elements, and only returns false
between the beginParsingChildren() and finishParsingChildren().

BUG=341414

Review URL: https://codereview.chromium.org/142413014

git-svn-id: svn://svn.chromium.org/blink/trunk@166645 bbb929c8-8fbe-4397-9dbb-9b2b20218538
7 files changed
tree: c104b73ed562799c510d1e874716cb5bbb0e3818
  1. third_party/