Remove StaticLayout.addMeasuredRun

StaticLayout.addMeasuredRun is used if the TextPaint is subclassed.
However, developers can't do almost anything by subclassing TextPaint
since most of default things are done in native code. So we don't need to
support this tricky case anymore.

Bug: 65024629
Bug: 67009717
Test: bit FrameworksCoreTests:android.text.StaticLayoutLineBreakingTest
Change-Id: I290b8b7d3e1fcff7be78e4bd1e620d6c188a10ad