Revert "Relativize cros compiler path"

This reverts commit be7c1259.

Reason for revert: Can't find gold.
/bin/sh: 1: ../../build/toolchain/cros/build/cros_cache/chrome-sdk/tarballs/daisy+10974.0.0+target_toolchain/usr/x86_64-pc-linux-gnu/armv7a-cros-linux-gnueabi/binutils-bin/2.27.0-gold: not found






Original change's description:
> Relativize cros compiler path
> 
> Combined with https://chromium-review.googlesource.com/c/chromiumos/chromite/+/1180801
> this patch removes absolute path from command line for simple chrome build.
> 
> This is a part of effort for build cache sharing when using goma by
> removing absolute path from compile result.
> 
> Bug: chromium:846610
> Change-Id: Ia40a7194b4e485f26424f27ebfc210355e352cc0
> Reviewed-on: https://chromium-review.googlesource.com/1180826
> Reviewed-by: Dirk Pranke <dpranke@chromium.org>
> Commit-Queue: Takuto Ikuta <tikuta@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#584648}

TBR=vapier@chromium.org,dpranke@chromium.org,tikuta@chromium.org,manojgupta@chromium.org

Change-Id: I93891636a39e5b72f019f262c297c4f07239d0e2
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: chromium:846610
Reviewed-on: https://chromium-review.googlesource.com/1182882Reviewed-by: Yoshifumi Inoue <yosin@chromium.org>
Commit-Queue: Yoshifumi Inoue <yosin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#584649}

build/toolchain/cros/BUILD.gn

@@ -12,15 +12,6 @@ gcc_toolchain("target") {
   ar = cros_target_ar
   cc = cros_target_cc
   cxx = cros_target_cxx
-
-  # Relativize path if compiler is specified such that not to lookup from $PATH.
-  if (cc != get_path_info(cc, "file")) {
-    cc = rebase_path(cc, root_build_dir)
-  }
-  if (cxx != get_path_info(cxx, "file")) {
-    cxx = rebase_path(cxx, root_build_dir)
-  }
-
   ld = cxx
   if (cros_target_ld != "") {
     ld = cros_target_ld
@@ -55,14 +46,6 @@ gcc_toolchain("nacl_bootstrap") {
   ar = cros_target_ar
   cc = cros_target_cc
   cxx = cros_target_cxx
-
-  # Relativize path if compiler is specified such that not to lookup from $PATH.
-  if (cc != get_path_info(cc, "file")) {
-    cc = rebase_path(cc, root_build_dir)
-  }
-  if (cxx != get_path_info(cxx, "file")) {
-    cxx = rebase_path(cxx, root_build_dir)
-  }
   ld = cxx
   if (cros_target_ld != "") {
     ld = cros_target_ld
@@ -94,14 +77,6 @@ gcc_toolchain("host") {
   ar = cros_host_ar
   cc = cros_host_cc
   cxx = cros_host_cxx
-
-  # Relativize path if compiler is specified such that not to lookup from $PATH.
-  if (cc != get_path_info(cc, "file")) {
-    cc = rebase_path(cc, root_build_dir)
-  }
-  if (cxx != get_path_info(cxx, "file")) {
-    cxx = rebase_path(cxx, root_build_dir)
-  }
   ld = cxx
   if (cros_host_ld != "") {
     ld = cros_host_ld
@@ -131,14 +106,6 @@ gcc_toolchain("v8_snapshot") {
   ar = cros_v8_snapshot_ar
   cc = cros_v8_snapshot_cc
   cxx = cros_v8_snapshot_cxx
-
-  # Relativize path if compiler is specified such that not to lookup from $PATH.
-  if (cc != get_path_info(cc, "file")) {
-    cc = rebase_path(cc, root_build_dir)
-  }
-  if (cxx != get_path_info(cxx, "file")) {
-    cxx = rebase_path(cxx, root_build_dir)
-  }
   ld = cxx
   if (cros_v8_snapshot_ld != "") {
     ld = cros_v8_snapshot_ld