Stack sampling profiler: fix off-by-one error on truncated stacks

Stack sampling profiler: fix off-by-one error on truncated stacks

Stacks that are truncated due to the Win32StackFrameUnwinder being
unable to unwind are being reported with an extra frame.

BUG=555770
Committed: https://crrev.com/c2259413238814894aadcbbe07c8e1a8c12b2413
Cr-Commit-Position: refs/heads/master@{#361230}

[Mike Wittman, 2015-11-23 17:38:29]

wittman@chromium.org changed reviewers:
+ brucedawson@chromium.org

[Mike Wittman, 2015-11-23 17:38:29]

PTAL

[brucedawson, 2015-11-23 20:41:11]

lgtm

[Mike Wittman, 2015-11-23 20:41:57]

The CQ bit was checked by wittman@chromium.org

[commit-bot: I haz the power, 2015-11-23 20:44:31]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1469983002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1469983002/1

[commit-bot: I haz the power, 2015-11-23 22:20:24]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2015-11-23 22:20:24]

Try jobs failed on following builders:
  linux_chromium_chromeos_rel_ng on tryserver.chromium.linux (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.linux/builders/linux_chromium_...)

[Mike Wittman, 2015-11-23 23:29:32]

The CQ bit was checked by wittman@chromium.org

[Mike Wittman, 2015-11-23 23:29:32]

The patchset sent to the CQ was uploaded after l-g-t-m from
brucedawson@chromium.org
Link to the patchset: https://codereview.chromium.org/1469983002/#ps20001
(title: "update tests")

[commit-bot: I haz the power, 2015-11-23 23:30:24]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1469983002/20001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1469983002/20001

[commit-bot: I haz the power, 2015-11-24 01:02:51]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2015-11-24 01:03:45]

Patchset 2 (id:??) landed as
https://crrev.com/c2259413238814894aadcbbe07c8e1a8c12b2413
Cr-Commit-Position: refs/heads/master@{#361230}