Linux: Use gold for 32-bit builds as well.

build/common.gypi

Index: build/common.gypi
===================================================================
--- build/common.gypi	(revision 124740)
+++ build/common.gypi	(working copy)
@@ -398,7 +398,7 @@
 
         # linux_use_gold_binary: whether to use the binary checked into
         # third_party/gold.
-        ['host_arch=="x64" and OS!="android"', {
+        ['OS=="linux"', {
           'linux_use_gold_binary%': 1,
         }, {
           'linux_use_gold_binary%': 0,
@@ -407,7 +407,7 @@
         # linux_use_gold_flags: whether to use build flags that rely on gold.
         # On by default for x64 Linux.  Temporarily off for ChromeOS as
         # it failed on a buildbot.
-        ['host_arch=="x64" and chromeos==0 and OS!="android"', {
+        ['OS=="linux" and chromeos==0', {
           'linux_use_gold_flags%': 1,
         }, {
           'linux_use_gold_flags%': 0,