Rename some crash related methods and improve debugging.

Rename some crash related methods and improve debugging.

Using a debugger with the thread watcher active is kind of a pain because it
generates crashes that cannot be easily ignored after the fault. So generate
a debug break instead of an access violation.

Also, it is misleading to inspect crash dumps that have NullPointerCrash() on
the stack when the code doesn't actually crash.

BUG=

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=289866

[rvargas (doing something else), 2014-08-15 00:15:42]

Hi Raman,

I want to check in this change, but I'm afraid it will mess the bucketing code
if we don't update that first. Is that correct?

[ramant (doing other things), 2014-08-15 00:23:32]

LGTM. 

Will make the change to chromecrash to support the new signatures after this CL
is committed and we get a crash dump. Will leave the old signatures for backward
compatibility.

Many thanks for making this change.

[rvargas (doing something else), 2014-08-15 00:27:00]

The CQ bit was checked by rvargas@chromium.org

[commit-bot: I haz the power, 2014-08-15 00:32:47]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/rvargas@chromium.org/477023002/1

[commit-bot: I haz the power, 2014-08-15 15:22:48]

Committed patchset #1 (1) as 289866