RFR: 8273655: content-types.properties files are missing some common types [v2]

[Julia Boes]

> This change adds some common types to the content-type.properties files, notably .js, .css, and .jar, as well as some others. 
> 
> The duplicated entry for .zip is removed from the Windows properties file.

Julia Boes has updated the pull request incrementally with one additional commit since the last revision:

  address PR comments and refactor test

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Changes:
  - all: https://git.openjdk.java.net/jdk/pull/5506/files
  - new: https://git.openjdk.java.net/jdk/pull/5506/files/63565c5b..c7512889

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=5506&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=5506&range=00-01

  Stats: 179 lines in 3 files changed: 70 ins; 45 del; 64 mod
  Patch: https://git.openjdk.java.net/jdk/pull/5506.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/5506/head:pull/5506

PR: https://git.openjdk.java.net/jdk/pull/5506