RFR: 8277463: JFileChooser with Metal L&F doesn't show non-canonical UNC path in - Look in

[Masanori Yano]

I would like to fix the bug reported in JDK-8277463.

As reporter's investigation, ShellFolder.getNormalizedFile() returns incorrect value for non-canonical Windows UNC path. getNormalizedFile() is used for symbolic link path, but Windows environment does not handle symbolic link. And, getCanonicalFile() returns correct path for a directory link in Windows which is made with `mklink` command. So getNormalizedFile() should perform to return getCanonicalFile() like WindowsFileChooserUI.addItem() at Windows environment.

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Commit messages:
 - 8277463: JFileChooser with Metal L&F doesn't show non-canonical UNC path in - Look in

Changes: https://git.openjdk.java.net/jdk/pull/6796/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=6796&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8277463
  Stats: 128 lines in 2 files changed: 127 ins; 0 del; 1 mod
  Patch: https://git.openjdk.java.net/jdk/pull/6796.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/6796/head:pull/6796

PR: https://git.openjdk.java.net/jdk/pull/6796