RFR: JDK-8344303 : Remove usage of URLUtil.getConnectPermission from sun.awt.SunToolkit and sun.awt.image.URLImageSource [v3]

[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)

Harshitha Onkar has updated the pull request incrementally with one additional commit since the last revision:

  sun/net/util/URLUtil.java changes

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/22330/files
  - new: https://git.openjdk.org/jdk/pull/22330/files/0bf680e9..b516ba94

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=22330&range=02
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=22330&range=01-02

  Stats: 25 lines in 1 file changed: 0 ins; 25 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