RFR: JDK-8281007: Test jdk/javadoc/doclet/checkStylesheetClasses/CheckStylesheetClasses.java fails after JDK-8280738

[Jonathan Gibbons]

Remove review a trivial fix to remove a workaround for the absence of some CSS classes in HtmlStyle.java. Those snippet-related classes have now been added, and the workaround needs to be removed.

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Commit messages:
 - JDK-8281007: Test jdk/javadoc/doclet/checkStylesheetClasses/CheckStylesheetClasses.java fails after JDK-8280738

Changes: https://git.openjdk.java.net/jdk/pull/7293/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=7293&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8281007
  Stats: 3 lines in 1 file changed: 0 ins; 3 del; 0 mod
  Patch: https://git.openjdk.java.net/jdk/pull/7293.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/7293/head:pull/7293

PR: https://git.openjdk.java.net/jdk/pull/7293