Revert 64454 - Revert 64441 - Mac cloud print proxy work.

Turn on use_cups for the Mac, add in the required library, and tweak the code
to get it linking.  There is still more work to do; this is just a gyp-oriented
change to get things started.

BUG=none
TEST=All targets still build on all platforms.

Review URL: http://codereview.chromium.org/4167006

[email protected]
Review URL: http://codereview.chromium.org/4136011

[email protected]
Review URL: http://codereview.chromium.org/4137013

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@64477 0039d316-1c4b-4281-b951-d872f2087c98
diff --git a/build/common.gypi b/build/common.gypi
index 4d5836ee3..b8a31eba 100644
--- a/build/common.gypi
+++ b/build/common.gypi
@@ -392,7 +392,7 @@
           'NACL_WIN64',
         ],
       }],
-      ['OS=="linux" and chromeos==0 and target_arch!="arm"', {
+      ['OS=="mac" or (OS=="linux" and chromeos==0 and target_arch!="arm")', {
         'use_cups%': 1,
       }, {
         'use_cups%': 0,