RFR: 8250859: Address reliance on default constructors in the Accessibility APIs

[Conor Cleary]

This issue relates to JDK-8250639 '☂ Address reliance on default constructors in the java.desktop module'. The
following classes have had an explicit no-arg constructor added, with a protected access modifier and accompanying API
description:
 - Default ctor on com.sun.java.accessibility.util.SwingEventMonitor
 - Default ctor on javax.accessibility.AccessibleContext
 - Default ctor on javax.accessibility.AccessibleHyperlink

The following classes have had an explicit no-arg constructor added, with a public access modifier and accompanying API
description:
 - Default ctor on javax.accessibility.AccessibleResourceBundle
 - Default ctor on com.sun.java.accessibility.util.AWTEventMonitor
 - Default ctor on com.sun.java.accessibility.util.AccessibilityEventMonitor
 - Default ctor on com.sun.java.accessibility.util.AccessibilityListenerList
 - Default ctor on com.sun.java.accessibility.util.EventID

specdiff:
http://cr.openjdk.java.net/~ccleary/issues/webrevs-store/8250859/webrevs/webrev.00/specdiff/overview-summary.html bug:
https://bugs.openjdk.java.net/browse/JDK-8250859

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Commit messages:
 - 8250859: Address reliance on default constructors in the Accessibility APIs

Changes: https://git.openjdk.java.net/jdk/pull/174/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=174&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8250859
  Stats: 42 lines in 7 files changed: 35 ins; 0 del; 7 mod
  Patch: https://git.openjdk.java.net/jdk/pull/174.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/174/head:pull/174

PR: https://git.openjdk.java.net/jdk/pull/174