Bug 323489 [KeyBindings] Reduce memory footprint of BindingManager
bundles/org.eclipse.jface/src/org/eclipse/jface/bindings/BindingManager.java
* Notifies all of the listeners to this manager that the defined or active
	 * schemes of bindings have changed.
	 * </p>
	 * <p>
	 * The time this method takes to complete is dependent on external
	 * listeners.
	 * </p>
	 * 
	 * @param event
	 *            The event to send to all of the listeners; must not be
	 *            <code>null</code>.
	 */
	private final void fireBindingManagerChanged(final BindingManagerEvent event) {
		if (event == null) {
			throw new NullPointerException();
		}
		final Object[] listeners = getListeners();
		for (int i = 0; i < listeners.length; i++) {
			final IBindingManagerListener listener = (IBindingManagerListener) listeners[i];
			listener.bindingManagerChanged(event);
		}
	}
	/**
	 * <p>
	 * Returns the active bindings. The caller must not modify the returned map.
	 * </p>
	 * <p>
	 * This method completes in <code>O(1)</code>. If the active bindings are
	 * not yet computed, then this completes in <code>O(nn)</code>, where
	 * <code>n</code> is the number of bindings.