Follow up to fix v8::Exception::GetMessage() actually do what it was intended to.

Follow up to fix v8::Exception::GetMessage() actually do what it was intended to.

The main thing for v8::Exception::GetMessage() is to extract message location from
error stack trace, even when stack trace capturing is off (when DevTools is closed).

BUG=chromium:427954
R=yangguo@chromium.org
LOG=N

Committed: https://code.google.com/p/v8/source/detail?r=25101

[aandrey, 2014-10-31 15:13:55]

https://codereview.chromium.org/696703002/diff/1/src/isolate.cc
File src/isolate.cc (right):

https://codereview.chromium.org/696703002/diff/1/src/isolate.cc#newcode1162
src/isolate.cc:1162: if
(!ComputeLocationFromStackTrace(&potential_computed_location,
this was under the (capture_stack_trace_for_uncaught_exceptions_) flag, which is
not what needed for external unhandled promise rejections handler

[aandrey, 2014-10-31 16:34:38]

Blink side change: https://codereview.chromium.org/693183002/

[aandrey, 2014-11-02 15:49:54]

Patchset #2 (id:20001) has been deleted

[Yang, 2014-11-03 12:22:33]

On 2014/10/31 16:34:38, aandrey wrote:
> Blink side change: https://codereview.chromium.org/693183002/

lgtm.

[aandrey, 2014-11-04 10:06:52]

Committed patchset #1 (id:1) manually as 25101 (presubmit successful).