Clean up some Mac memory code.

Removes some forward declarations that were needed for <=10.7 and
updates a comment about how the code calculates memory on Mac that
was previously a TODO.

BUG=none

Review-Url: https://codereview.chromium.org/2782083003
Cr-Commit-Position: refs/heads/master@{#461939}


CrOS-Libchrome-Original-Commit: d84dc8d364680c7b6d60c37747d4362d0c049ed5
1 file changed
tree: 7733b4330072b153ba35194641338a429f402291
  1. base/
  2. build/
  3. components/
  4. dbus/
  5. device/
  6. ipc/
  7. mojo/
  8. testing/
  9. third_party/
  10. ui/