Update chrome/nacl.gypi to fix chromeos build

chrome/chrome_exe.gypi

Index: chrome/chrome_exe.gypi
diff --git a/chrome/chrome_exe.gypi b/chrome/chrome_exe.gypi
index f028efd8dce828e3930db0da38fb7049dc89b011..f292fad63a537aa34ea8013959fa183185154bc7 100644
--- a/chrome/chrome_exe.gypi
+++ b/chrome/chrome_exe.gypi
@@ -453,6 +453,17 @@
             '../third_party/adobe/flash/flash_player.gyp:flash_player',
           ],
         }],
+        ['OS=="linux"', {
+          'conditions': [
+            # For now, do not build nacl_helper on ARM or when disable_nacl=1
+            ['disable_nacl!=1 and target_arch!="arm"', {
+              'dependencies': [
+                'nacl_helper_bootstrap',
+                'nacl_helper',
+                ],
+            }],
+          ],
+        }],
         ['OS=="mac"', {
           'dependencies': [
             # On Mac, make sure we've built chrome_dll, which contains all of