Stack sampling profiler: remove RUNTIME_FUNCTION sanity check

This heuristic is causing lots of false positives resulting in
prematurely-truncated stacks. It shouldn't be necessary any longer, as
the check that the instruction pointer is in a valid module should fail
for this case before executing this test.

Also, bump the profiler enable percentage down to 15% while evaluating
this and future incremental changes. This is large enough to detect an
incrementally increased crash rate, while small enough that an
unexpected crasher will not cause a huge problem.

BUG=555770, 541650, 541419

Review URL: https://codereview.chromium.org/1465273002

Cr-Commit-Position: refs/heads/master@{#362526}


CrOS-Libchrome-Original-Commit: c383cfebcbf223980034223788973dff2f382d43
2 files changed
tree: afca7c0a3aa109ac2420f6ce4cf73763de472865
  1. base/
  2. build/
  3. components/
  4. dbus/
  5. device/
  6. ipc/
  7. mojo/
  8. testing/
  9. third_party/
  10. ui/