Revert of Track memory consumption of SP on top 7 sites. (patchset #1 id:1 of https...

Revert of Track memory consumption of SP on top 7 sites. (patchset #1 id:1 of https://codereview.chromium.org/1029283002/)

Reason for revert:
Causing failures on Win 7 Low-End Perf(2). See crbug.com/472600

Original issue's description:
> Track memory consumption of SP on top 7 sites.
>
> Tests:
> android: https://codereview.chromium.org/1023783006/
> linux & mac: https://codereview.chromium.org/1013723006/
> win: https://codereview.chromium.org/1038773002/
> All above pass the "Running With Patch" step.
>
> BUG=None
>
> Committed: https://crrev.com/fa186798a4aaf70197974d5d1f2639526d8a8384
> Cr-Commit-Position: refs/heads/master@{#323128}

TBR=pdr@chromium.org,chrishtr@chromium.org,schenney@chromium.org,sullivan@chromium.org,tonyg@chromium.org,pan.deng@intel.com
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=None

Review URL: https://codereview.chromium.org/1050083002

Cr-Commit-Position: refs/heads/master@{#323230}