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Currently we have the following two flags:

- m_didCallDispose is used to know whether AudioContext::dispose() is called or not.
- m_isMarkedForDeletion is used to guarantee the following facts:

--- AudioNode should not be re-registered to AudioNode::m_outputs after AudioNode::dispose is called.
--- AudioNode should not get marked as dirty after AudoNode::dispose is called.

We don't need the two flags; just one flag that is set in AudioContext::dispose() is enough.

This CL removes m_didCallDispose and m_isMarkedForDeletion and introduces m_isDisposeCalled. This CL doesn't change any behavior.

BUG=340522

Review URL: https://codereview.chromium.org/460303003

git-svn-id: svn://svn.chromium.org/blink/trunk@180330 bbb929c8-8fbe-4397-9dbb-9b2b20218538