RFR: 8254997: Remove unimplemented OSContainer::read_memory_limit_in_bytes

[Aleksey Shipilev]

The definition seems to be moved to CgroupSubsystem with JDK-8230305:
https://hg.openjdk.java.net/jdk/jdk/rev/931354c6323d#l7.494

The leftover declaration can be cleaned up.

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Commit messages:
 - 8254997: Remove unimplemented OSContainer::read_memory_limit_in_bytes

Changes: https://git.openjdk.java.net/jdk/pull/732/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=732&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8254997
  Stats: 2 lines in 1 file changed: 0 ins; 2 del; 0 mod
  Patch: https://git.openjdk.java.net/jdk/pull/732.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/732/head:pull/732

PR: https://git.openjdk.java.net/jdk/pull/732