RFR: 8274169: HotSpot Style Guide has stale link to chromium style guide

[Liam Miller-Cushon]

Update links to the chromium style guide in the HotSpot Style Guide.

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Commit messages:
 - 8274169: HotSpot Style Guide has stale link to chromium style guide

Changes: https://git.openjdk.java.net/jdk/pull/5641/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=5641&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8274169
  Stats: 2 lines in 2 files changed: 0 ins; 0 del; 2 mod
  Patch: https://git.openjdk.java.net/jdk/pull/5641.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/5641/head:pull/5641

PR: https://git.openjdk.java.net/jdk/pull/5641