Use runtime ABI instead of hw architecture when processing microdumps

The "CPU architecture" field is being filled from the wrong part of
the microdump. The microdump OS/arch line looks like:
O A arm 04 armv7l 3.4.0-perf-g4d6e88e #1 SMP PREEMPT Mon Mar 30 19:09:30 2015
and currently the field that says "armv7l" or "aarch64" is being used
to fill in the CPU arch field in crash. The problem is that on a
64-bit device this field *always* says "aarch64" even when running in
a 32-bit process, and so currently the crash reports for aarch64 are
a mix of 32-bit and 64-bit crashes. We should be using the first field
instead, which just says "arm" or "arm64" and reflects the actual
version of webview (32-bit or 64-bit) which is running.

BUG=
R=primiano@chromium.org

Committed: https://code.google.com/p/google-breakpad/source/detail?r=1498

[mmandlis, 2015-08-21 23:16:34]

mmandlis@chromium.org changed reviewers:
+ primiano@chromium.org

[Primiano Tucci (use gerrit), 2015-08-25 07:55:55]

Code LGTM, but please reformat the CL description.
Should look like

Subject line (e.g., "Use runtime ABI instead of hw architecture when processing
microdumps")
(blank line)
longer description wrapped @ 72 cols


P.S. I think there might be some tests depending on this.
Is "make check" happy?

[Primiano Tucci (use gerrit), 2015-08-25 07:58:44]

On 2015/08/25 07:55:55, Primiano Tucci wrote:
> Code LGTM, but please reformat the CL description.
> Should look like
> 
> Subject line (e.g., "Use runtime ABI instead of hw architecture when
processing
> microdumps")
> (blank line)
> longer description wrapped @ 72 cols
> 
> 
> P.S. I think there might be some tests depending on this.
> Is "make check" happy?

Yeah I think you need to update also
src/processor/microdump_processor_unittest.cc

[mmandlis, 2015-08-25 22:27:38]

All the tests are passing now, thanks for your help.
PTAL, does it still look ok, can I submit?

thanks.

[Primiano Tucci (use gerrit), 2015-08-25 22:46:57]

On 2015/08/25 22:27:38, mmandlis wrote:
> All the tests are passing now, thanks for your help.
> PTAL, does it still look ok, can I submit?
> 
> thanks.

Still LGTM, thanks!

[mmandlis, 2015-08-26 16:19:12]

Committed patchset #3 (id:40001) manually as 1498 (presubmit successful).