Remove pre-1.2 SecurityManager text from java.awt.Toolkit

Summary

Remove pre-JDK 1.2 SecurityManager text and and related code from java.awt.Toolkit class

Problem

Support for pre-JDK 1.2 SecurityManager was removed under JDK-8189750. So it is necessary to update classes in java.desktop module accordingly.

Solution

It is necessary to update description of java.awt.Toolkit.getImage(URL u) and java.awt.Toolkit.createImage(URL u) to get rid of “pre JDK 1.2 SecurityManager” text. Also the corresponding fallback code should be removed from SunToolkit.checkPermission(URL u) and from the constructor of URLImageSource.

Specification

Changing API spec of java.awt.Toolkit.getImage(URL url)

from:

 * then {@code URLPermission} is used for security checks.
 * For compatibility with pre-1.2 security managers, if the access
 * is denied with {@code FilePermission} or {@code SocketPermission},
 * the method throws the {@code SecurityException}
 * if the corresponding 1.1-style SecurityManager.checkXXX method
 * also denies permission.
 * @param     url   the URL to use in fetching the pixel data.

to:

 * then {@code URLPermission} is used for security checks.
 * @param     url   the URL to use in fetching the pixel data.

Changing API spec of java.awt.Toolkit.createImage(URL url)

from:

 * then {@code URLPermission} is used for security checks.
 * For compatibility with pre-1.2 security managers, if the access
 * is denied with {@code FilePermission} or {@code SocketPermission},
 * the method throws the {@code SecurityException}
 * if the corresponding 1.1-style SecurityManager.checkXXX method
 * also denies permission.
 * @param     url   the URL to use in fetching the pixel data.

to:

 * then {@code URLPermission} is used for security checks.
 * @param     url   the URL to use in fetching the pixel data.