Switching profiler instrumentations from ScopedProfile to ScopedTracker

Switching profiler instrumentations from ScopedProfile to ScopedTracker. This will disable the instrumentations in all channels except Canary, and developer build. Instrumentations are only enabled in Browser process.

This will prevent Stable from sending increased amounts of UMA logs. Also, this will let us observe "true" (untouched by instrumentations) jankiness numbers every week in Dev channel.

BUG=401560
Committed: https://crrev.com/09e7ebe02c71d923e4655a0ad5e151b97344f091
Cr-Commit-Position: refs/heads/master@{#301950}

[vadimt, 2014-10-28 21:14:52]

vadimt@chromium.org changed reviewers:
+ brettw@chromium.org

[vadimt, 2014-10-28 21:14:53]

brettw@ please provide OWNER's rubberstamp for everything.

I'm pretty much sure that this array of monotonous replacements qualifies for
TBR, but perhaps, YMMV.

All files were changed in the same way, so looking at any will give a complete
idea of the change.

Thanks!

[brettw, 2014-10-29 20:53:01]

lgtm

[vadimt, 2014-10-29 20:53:53]

The CQ bit was checked by vadimt@chromium.org

[commit-bot: I haz the power, 2014-10-29 20:55:24]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/686963002/1

[commit-bot: I haz the power, 2014-10-29 22:10:53]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2014-10-29 22:11:39]

Patchset 1 (id:??) landed as
https://crrev.com/09e7ebe02c71d923e4655a0ad5e151b97344f091
Cr-Commit-Position: refs/heads/master@{#301950}