Remove references to DrMemory from chromium repo.

This removes references to DrMemory for MB, GN and buildbot, and also
removes references to redundant DrMemory bots and DrMemory targets.

BUG=655521, 644217

Review-Url: https://codereview.chromium.org/2455463002
Cr-Commit-Position: refs/heads/master@{#430388}
NOKEYCHECK=True
GitOrigin-RevId: e02ee8681a05a4e85552ec37e2a6999b0f2e76d9
1 file changed
tree: a83423d629c353b41211c82fe0a75a55857af8fc
  1. BUILD.gn
  2. DEPS
  3. LICENSE
  4. OWNERS
  5. README.chromium