Revert "[fuchsia_system_metrics] Remove memory metric. Migrated to memory project."

This reverts commit 1eac0e5efb055ac32b630c9034d81ce3d759e901.

Reason for revert: Roller is broken: https://turquoise-internal-review.googlesource.com/c/integration/+/171596

Original change's description:
> [fuchsia_system_metrics] Remove memory metric. Migrated to memory project.
> 
> Wait until this CL is landed:
> https://fuchsia-review.googlesource.com/c/fuchsia/+/351355/
> 
> Bug: 40088
> 
> Change-Id: I3cb99a70bbad4785650664b27a1a358dc369fbc2

TBR=rudominer@google.com,zmbush@google.com,stevefung@google.com,gracelaw@google.com

Change-Id: Ib40f17c7cfd77eb42783b1dff50cfb4a5a447240
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 40088
1 file changed
tree: 39c0f91e9e497d8e8a7beac0a5929b4ccc44c8e1
  1. .gitignore
  2. BUILD.gn
  3. OWNERS
  4. check.py
  5. cobalt_internal/
  6. fuchsia/
  7. projects.yaml