RenderFrameImpl: don't call DumpWithoutCrashing() on Linux
Contrary to its name, DumpWithoutCrashing() will always crash when
called from a Linux renderer process when breakpad and sandboxing are
enabled. Fixing this will require changes to breakpad and possibly
the seccomp-bpf sandbox, so for the time being stop the crash server
from getting flooded with useless stack traces.
BUG=349600
Review URL: https://codereview.chromium.org/
263743003
git-svn-id: svn://svn.chromium.org/chrome/trunk/src@267466 0039d316-1c4b-4281-b951-d872f2087c98