predictors: Remove unused histograms for speculative_prefetch_predictor.

predictors: Remove unused histograms for speculative_prefetch_predictor.

These histograms will no longer be accurate and prevent code
refactoring and improvements.

Also fixes the presubmit check: cannot assume that the first element of
sys.path is '.', and tools/python doesn't contain __init__.py.

BUG=631966
Committed: https://crrev.com/997952d9496f57bdc4434d515a50770dd5735715
Cr-Commit-Position: refs/heads/master@{#416232}

[Benoit L, 2016-09-01 16:27:52]

The CQ bit was checked by lizeb@chromium.org to run a CQ dry run

[commit-bot: I haz the power, 2016-09-01 16:28:15]

Dry run: CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[commit-bot: I haz the power, 2016-09-01 17:19:51]

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

[commit-bot: I haz the power, 2016-09-01 17:19:51]

Dry run: This issue passed the CQ dry run.

[Benoit L, 2016-09-01 18:32:31]

lizeb@chromium.org changed reviewers:
+ isherman@chromium.org, pasko@chromium.org

[Benoit L, 2016-09-01 18:33:33]

On 2016/09/01 18:32:31, Benoit L wrote:

isherman: please review histograms.xlm and presubmit_util.py, thanks!
pasko: everything :-)

[Ilya Sherman, 2016-09-01 19:13:42]

//tools/metrics LGTM, thanks =)

[pasko, 2016-09-02 10:55:57]

LGTM, thank you

[Benoit L, 2016-09-02 10:58:44]

The CQ bit was checked by lizeb@chromium.org

[commit-bot: I haz the power, 2016-09-02 10:59:16]

CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[commit-bot: I haz the power, 2016-09-02 11:03:37]

Committed patchset #3 (id:40001)

[commit-bot: I haz the power, 2016-09-02 11:05:51]

Description was changed from

==========
predictors: Remove unused histograms for speculative_prefetch_predictor.

These histograms will no longer be accurate and prevent code
refactoring and improvements.

Also fixes the presubmit check: cannot assume that the first element of
sys.path is '.', and tools/python doesn't contain __init__.py.

BUG=631966
==========

to

==========
predictors: Remove unused histograms for speculative_prefetch_predictor.

These histograms will no longer be accurate and prevent code
refactoring and improvements.

Also fixes the presubmit check: cannot assume that the first element of
sys.path is '.', and tools/python doesn't contain __init__.py.

BUG=631966

Committed: https://crrev.com/997952d9496f57bdc4434d515a50770dd5735715
Cr-Commit-Position: refs/heads/master@{#416232}
==========

[commit-bot: I haz the power, 2016-09-02 11:05:52]

Patchset 3 (id:??) landed as
https://crrev.com/997952d9496f57bdc4434d515a50770dd5735715
Cr-Commit-Position: refs/heads/master@{#416232}