A break location is considered muted if it has break points, but their
conditions all evaluate to false. Aside from not triggering break
events, debugger statements and exceptions are also ignored.

R=verwaest@chromium.org
BUG=chromium:429167
LOG=Y

Review URL: https://codereview.chromium.org/1610073002

Cr-Commit-Position: refs/heads/master@{#33429}