Temporarily disable calls to OS::TotalPhysicalMemory to avoid ASSERT when running under the Chrome …

Temporarily disable calls to OS::TotalPhysicalMemory to avoid ASSERT when running under the Chrome Sandbox.

This CL reverts the behaviour added in r16983 to avoid calling OS::TotalPhysicalMemory
which fails an assert in the Chrome Sandbox.  It reverts the default
ResourceConstraints behaviour to that of V8 before r16983 (i.e., baseing these
values purely on hard-coded checks against 64bit/32bit and Android/non-Android.
This will be reverted once http://crbug.com/312241 has been resolved.

BUG=312241
R=titzer@chromium.org

Committed: https://code.google.com/p/v8/source/detail?r=17415

[rmcilroy, 2013-10-28 10:16:25]

This, plus https://codereview.chromium.org/26868004/ should get rid of the
ASSERTS in debug chromium until http://crbug.com/312241 is fixed.  PTAL.

[titzer, 2013-10-28 12:31:31]

lgtm

[titzer, 2013-10-28 12:31:31]

lgtm

lgtm

[titzer, 2013-10-28 14:54:33]

Committed patchset #1 manually as r17415.