Revert of Fix free memory calculation.

Revert of Fix free memory calculation. (patchset #27 id:520001 of https://codereview.chromium.org/2558043007/ )

Reason for revert:
SysInfoTest.AmountOfAvailablePhysicalMemory is failing

BUG=703522
Original issue's description:
> Fix free memory calculation.
> 
> The term "free memory" can mean different things: it can mean
> 1) absolutely/pure free physical memory (not consumed by anything) or
> 2) it can include the inactive part(s) of OS (file) cache(s) or
> 3) it can mean the maximum amount of physical memory that can be
> allocated quickly without swapping and thus can also include the
> active part(s) of OS cache(s).
> 
> This CL fixes base::AmountOfAvailablePhysicalMemory() to function
> according to the 2nd meaning on all platforms where it is possible
> because this is what everyone needs most of the time. (Win platform
> has already had such implementation but others haven't).
> 
> BUG=672745
> 
> Review-Url: https://codereview.chromium.org/2558043007
> Cr-Commit-Position: refs/heads/master@{#458291}
> Committed: https://chromium.googlesource.com/chromium/src/+/a4258cad75d8cc63170555cc74bd584b5bfca965

TBR=primiano@chromium.org,danakj@chromium.org,brucedawson@chromium.org,xiyuan@chromium.org,chrisha@chromium.org,haraken@chromium.org,mkolom@yandex-team.ru
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=672745
Review-Url: https://codereview.chromium.org/2766623002
Cr-Commit-Position: refs/heads/master@{#458333}
Committed: https://chromium.googlesource.com/chromium/src/+/ad039f65398a94f4a28751c303df388cff4bbca3

[horo, 2017-03-21 07:01:26]

The CQ bit was checked by horo@chromium.org

[horo, 2017-03-21 07:01:27]

Created Revert of Fix free memory calculation.

[commit-bot: I haz the power, 2017-03-21 07:02:02]

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, 2017-03-21 07:03:00]

CQ is committing da patch.

Bot data: {"patchset_id": 1, "attempt_start_ts": 1490079686649100, "parent_rev":
"0ab7fa9db6a4cf7a6234388a2459275b709ff573", "commit_rev":
"ad039f65398a94f4a28751c303df388cff4bbca3"}

[commit-bot: I haz the power, 2017-03-21 07:04:13]

Description was changed from

==========
Revert of Fix free memory calculation. (patchset #27 id:520001 of
https://codereview.chromium.org/2558043007/ )

Reason for revert:
SysInfoTest.AmountOfAvailablePhysicalMemory is failing

BUG=703522

Original issue's description:
> Fix free memory calculation.
> 
> The term "free memory" can mean different things: it can mean
> 1) absolutely/pure free physical memory (not consumed by anything) or
> 2) it can include the inactive part(s) of OS (file) cache(s) or
> 3) it can mean the maximum amount of physical memory that can be
> allocated quickly without swapping and thus can also include the
> active part(s) of OS cache(s).
> 
> This CL fixes base::AmountOfAvailablePhysicalMemory() to function
> according to the 2nd meaning on all platforms where it is possible
> because this is what everyone needs most of the time. (Win platform
> has already had such implementation but others haven't).
> 
> BUG=672745
> 
> Review-Url: https://codereview.chromium.org/2558043007
> Cr-Commit-Position: refs/heads/master@{#458291}
> Committed:
https://chromium.googlesource.com/chromium/src/+/a4258cad75d8cc63170555cc74bd...

TBR=primiano@chromium.org,danakj@chromium.org,brucedawson@chromium.org,xiyuan...
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=672745
==========

to

==========
Revert of Fix free memory calculation. (patchset #27 id:520001 of
https://codereview.chromium.org/2558043007/ )

Reason for revert:
SysInfoTest.AmountOfAvailablePhysicalMemory is failing

BUG=703522

Original issue's description:
> Fix free memory calculation.
> 
> The term "free memory" can mean different things: it can mean
> 1) absolutely/pure free physical memory (not consumed by anything) or
> 2) it can include the inactive part(s) of OS (file) cache(s) or
> 3) it can mean the maximum amount of physical memory that can be
> allocated quickly without swapping and thus can also include the
> active part(s) of OS cache(s).
> 
> This CL fixes base::AmountOfAvailablePhysicalMemory() to function
> according to the 2nd meaning on all platforms where it is possible
> because this is what everyone needs most of the time. (Win platform
> has already had such implementation but others haven't).
> 
> BUG=672745
> 
> Review-Url: https://codereview.chromium.org/2558043007
> Cr-Commit-Position: refs/heads/master@{#458291}
> Committed:
https://chromium.googlesource.com/chromium/src/+/a4258cad75d8cc63170555cc74bd...

TBR=primiano@chromium.org,danakj@chromium.org,brucedawson@chromium.org,xiyuan...
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=672745

Review-Url: https://codereview.chromium.org/2766623002
Cr-Commit-Position: refs/heads/master@{#458333}
Committed:
https://chromium.googlesource.com/chromium/src/+/ad039f65398a94f4a28751c303df...
==========

[commit-bot: I haz the power, 2017-03-21 07:04:14]

Committed patchset #1 (id:1) as
https://chromium.googlesource.com/chromium/src/+/ad039f65398a94f4a28751c303df...