[OpenJDK 2D-Dev] RFR: 8263894: Convert defaultPrinter and printers fields to local variables [v2]

[Alexey Ivanov]

> `PrintServiceLookupProvider` has `defaultPrinter` and `printers` fields but they are used only in `getDefaultPrintService()` and `refreshServices()` correspondingly. Thus these two fields can be converted to local variables in the corresponding methods.

Alexey Ivanov has updated the pull request incrementally with one additional commit since the last revision:

  Bring back the comment for printServices

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Changes:
  - all: https://git.openjdk.java.net/jdk/pull/3095/files
  - new: https://git.openjdk.java.net/jdk/pull/3095/files/cfe460c2..2b98fec2

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=3095&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=3095&range=00-01

  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.java.net/jdk/pull/3095.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/3095/head:pull/3095

PR: https://git.openjdk.java.net/jdk/pull/3095