RFR: JDK-8344303 : Remove usage of URLUtil.getConnectPermission from sun.awt.SunToolkit and sun.awt.image.URLImageSource

[Harshitha Onkar]

sun.awt.SunToolkit and sun.awt.image.URLImageSource are calling sun.net.util.URLUtil.getConnectPermission(URL)
With the SecurityManager gone there's no need to call this method anymore. 

There are other checkPermissions in these 2 files - SunToolkit, URLImageSource but I have removed only those that are related to URLUtil.getConnectPermission(URL). Other checkPermission removal will be handled in a separate issue.

Integrating this PR will allow to proceed with a dependent JBS issue - [JDK-8344180](https://bugs.openjdk.org/browse/JDK-8344180)

-------------

Commit messages:
 - URLUtil.getConnectPermission() removal

Changes: https://git.openjdk.org/jdk/pull/22330/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=22330&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8344303
  Stats: 35 lines in 2 files changed: 0 ins; 35 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/22330.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/22330/head:pull/22330

PR: https://git.openjdk.org/jdk/pull/22330