RFR: 8354053: Remove unused JavaIOFilePermissionAccess

[Chen Liang]

On Fri, 11 Apr 2025 21:26:08 GMT, Roger Riggs <rriggs at openjdk.org> wrote:

> The JavaIOFilePermissionAccess interface is removed from SharedSecrets and its implementation (FilePermCompat.java) used by the test is moved to java.io FilePermission where cross package access is not needed. 
> The test FilePermissionCollectionMerge is updated to access the internal implementation in FilePermission. 
> Modernized the initialization from the system property `jdk.io.permissionsUseCanonicalPath`. 
> The remaining support will be removed when FilePermission is removed.

src/java.base/share/classes/java/io/FilePermission.java line 254:

> 252: 
> 253:     // Construct a new Permission with altPath
> 254:     // Package private for use by test FilePermissionCollectionMerge

That test is already calling with reflection and +open, we can just make this private and non-static.

The last use of the original methods were removed when AccessControlContext was functionally removed. If security developers can check, maybe we can just remove these methods completely?

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PR Review Comment: https://git.openjdk.org/jdk/pull/24603#discussion_r2041089794