Disable sending persistent histograms from last session by default.

Disable sending persistent histograms from last session by default.

Moves the logic to a different location than before so that it only
affects upload of persistent histograms data and not other .pma
file metrics - like crashpad and installer.

BUG=706423
Review-Url: https://codereview.chromium.org/2782903002
Cr-Commit-Position: refs/heads/master@{#460465}
(cherry picked from commit c8cf9f23a6c3b6d69e9528d7e9a4f22f16b7d63e)

Review-Url: https://codereview.chromium.org/2790753002 .
Cr-Commit-Position: refs/branch-heads/3029@{#498}
Cr-Branched-From: 939b32ee5ba05c396eef3fd992822fcca9a2e262-refs/heads/master@{#454471}
Committed: https://chromium.googlesource.com/chromium/src/+/b2c65825c8708d115f09e3521fecebca46895b6b

[Alexei Svitkine (slow), 2017-03-30 21:08:55]

Description was changed from

==========
Disable sending persistent histograms from last session by default.

Moves the logic to a different location than before so that it only
affects upload of persistent histograms data and not other .pma
file metrics - like crashpad and installer.

BUG=706423

Review-Url: https://codereview.chromium.org/2782903002
Cr-Commit-Position: refs/heads/master@{#460465}
(cherry picked from commit c8cf9f23a6c3b6d69e9528d7e9a4f22f16b7d63e)
==========

to

==========
Disable sending persistent histograms from last session by default.

Moves the logic to a different location than before so that it only
affects upload of persistent histograms data and not other .pma
file metrics - like crashpad and installer.

BUG=706423

Review-Url: https://codereview.chromium.org/2782903002
Cr-Commit-Position: refs/heads/master@{#460465}
(cherry picked from commit c8cf9f23a6c3b6d69e9528d7e9a4f22f16b7d63e)

Review-Url: https://codereview.chromium.org/2790753002 .
Cr-Commit-Position: refs/branch-heads/3029@{#498}
Cr-Branched-From:
939b32ee5ba05c396eef3fd992822fcca9a2e262-refs/heads/master@{#454471}
Committed:
https://chromium.googlesource.com/chromium/src/+/b2c65825c8708d115f09e3521fec...
==========

[Alexei Svitkine (slow), 2017-03-30 21:08:57]

Committed patchset #1 (id:1) manually as
b2c65825c8708d115f09e3521fecebca46895b6b.