<AWT Dev> RFR: 8272756: Remove unnecessary explicit initialization of volatile variables in java.desktop

[Сергей Цыпанов]

This is a continuation of

- https://bugs.openjdk.java.net/browse/JDK-6736490
- https://bugs.openjdk.java.net/browse/JDK-8035284
- https://bugs.openjdk.java.net/browse/JDK-8145680
- https://bugs.openjdk.java.net/browse/JDK-8251548

As mentioned in JDK-6736490:

_An explicit initialization of a volatile class instance variable, such as private volatile Object = null; or private volatile int scale = 0; is unnecessary since the Java spec automatically initializes objects to null and primitive type short, int, long, float and double to 0 and boolean to false. Explicit initialization of volatile variable to a value the same as the default implicit initialized value results in an unnecessary store and membar operation._

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Commit messages:
 - 8272756: Remove unnecessary explicit initialization of volatile fields in java.desktop

Changes: https://git.openjdk.java.net/jdk/pull/5197/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=5197&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8272756
  Stats: 50 lines in 25 files changed: 0 ins; 0 del; 50 mod
  Patch: https://git.openjdk.java.net/jdk/pull/5197.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/5197/head:pull/5197

PR: https://git.openjdk.java.net/jdk/pull/5197