<AWT Dev> RFR: 8260619: Add final modifier to several DataFlavor static fields

[Sergey Bylokhov]

This request proposes changing the state of a few static constants in the DataFlavor class.

The fields selectionHtmlFlavor/fragmentHtmlFlavor/allHtmlFlavor added to the java.awt.datatransfer.DataFlavor class in JDK8 were not marked as final as are other similar constants in this class.

See more information in CSR: https://bugs.openjdk.java.net/browse/JDK-8260620

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Commit messages:
 - Merge branch 'master' into JDK-8260619
 - Update DataFlavor.java
 - Merge branch 'master' into JDK-8260619
 - Update DataFlavor.java

Changes: https://git.openjdk.java.net/jdk/pull/3134/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=3134&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8260619
  Stats: 6 lines in 1 file changed: 0 ins; 0 del; 6 mod
  Patch: https://git.openjdk.java.net/jdk/pull/3134.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/3134/head:pull/3134

PR: https://git.openjdk.java.net/jdk/pull/3134