Roll breakpad and fix signal propagation for WebView crash handler

Roll breakpad and fix signal propagation for WebView crash handler

This applies the fix described in https://breakpad.appspot.com/6844002
to both Breakpad and the 2nd Android WebView crash handler (aw_crash_handler)
aw_crash_handler, which is soon to be deprecated and incorporated in
the breakpad microdump one, prints the version code upon a crash,
reuses the same breakpad signal handling logic and, threrefore,
requires the same fix.

The following revision is pulled in by the breakpad roll:
https://chromium.googlesource.com/external/google-breakpad/src/+/9fcbe255a64d39295ad5f1f15c0b92db3da83c0f

BUG=483399
Committed: https://crrev.com/e5e3d99fedbb267b55b33376ff82eb244291579d
Cr-Commit-Position: refs/heads/master@{#327921}

[Primiano Tucci (use gerrit), 2015-05-01 09:32:30]

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

[Torne, 2015-05-01 09:45:24]

lgtm

[Primiano Tucci (use gerrit), 2015-05-01 15:53:03]

The CQ bit was checked by primiano@chromium.org

[commit-bot: I haz the power, 2015-05-01 15:54:06]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1113353002/1

[commit-bot: I haz the power, 2015-05-01 16:39:38]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-05-01 16:40:39]

Patchset 1 (id:??) landed as
https://crrev.com/e5e3d99fedbb267b55b33376ff82eb244291579d
Cr-Commit-Position: refs/heads/master@{#327921}