Revert 121068 - linux: add a use_gold flag that defaults to on

Revert 121068 - linux: add a use_gold flag that defaults to on

Currently, gyp attempts to autodetect whether the linker supports
the --icf flag.  It's more predictable to just require the caller
to specify whether they're using gold.

As a first demonstration of this, drop LINKER_USES_ICF code in the
Chrome build.  (I'll follow up with a gyp patch to remove the
LINKER_USES_ICF stuff in gyp.)


Review URL: http://codereview.chromium.org/9316110

TBR=evan@chromium.org
Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=121165