Fix mistake in current APIs.

    method public final int addChild(android.graphics.drawable.Drawable);

    method public synchronized boolean canConstantState();

    method protected void computeConstantSize();

    method public final int getCapacity();

    method public int getChangingConfigurations();

    method public final android.graphics.drawable.Drawable getChild(int);

    method public final int getChildCount();

    method public void growArray(int, int);

    method public final boolean isConstantSize();

    method public final boolean isStateful();

    method public final void mutate();

    method public final void setConstantSize(boolean);

    method public final void setEnterFadeDuration(int);

    method public final void setExitFadeDuration(int);