ipc: Make MessageAttachment inherit from RefCountedThreadSafe.

Previously, it inherited from RefCounted, which was wrong, since it's possible
for multiple threads to simultaneously have scoped_ptr references to a single
MessageAttachment.

BUG=535711

Review URL: https://codereview.chromium.org/1408793008

Cr-Commit-Position: refs/heads/master@{#357216}


CrOS-Libchrome-Original-Commit: fa705362defe8ba29f7ba93570ea5cb8a5df0981
1 file changed
tree: e948e8c8efda38c5453492eda907ca702c20840c
  1. base/
  2. build/
  3. components/
  4. dbus/
  5. device/
  6. ipc/
  7. mojo/
  8. testing/
  9. third_party/
  10. ui/