Revert of Revert "Revert of Telemetry: Last ditch effort to dump symbols on tab crashes if none ...

Revert of Revert "Revert of Telemetry: Last ditch effort to dump symbols on tab crashes if none are found (ht… (https://codereview.chromium.org/444453002/)

Reason for revert:
Macbots are getting stuck here:
[       OK ] page_runner_unittest.PageRunnerTests.testDiscardFirstResult (10464 ms)
[ RUN      ] page_runner_unittest.PageRunnerTests.testHandlingOfCrashedTab
[ RUN      ] chrome://crash

http://build.chromium.org/p/chromium.mac/waterfall?builder=Mac10.6%20Tests%20(3)
http://build.chromium.org/p/chromium.mac/waterfall?builder=Mac10.7%20Tests%20(3)

Original issue's description:
> Revert "Revert of Telemetry: Last ditch effort to dump symbols on tab crashes if none are found (https://codereview.chromium.org/318123002/)"
> 
> This reverts https://codereview.chromium.org/320693002/
> 
> The original regression this caused (PageRunnerTests.testHandlingOfCrashedTab in telemetry_unittests) does not seem to be happening anymore (locally or on trybots), but please revert and let me know if it happens on the main waterfall.
> 
> TBR=tonyg,dtu
> BUG=
> 
> Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=287612

TBR=tonyg@chromium.org,dtu@chromium.org,oysteine@chromium.org
NOTREECHECKS=true
NOTRY=true
BUG=

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=287652

[robliao, 2014-08-06 00:05:50]

Created Revert of Revert "Revert of Telemetry: Last ditch effort to dump symbols
on tab crashes if none are found (ht…

[commit-bot: I haz the power, 2014-08-06 00:09:09]

Change committed as 287652