[GCM] Cleanup for ios enabling

BUG=342317

Review URL: https://codereview.chromium.org/211973003

git-svn-id: http://src.chromium.org/svn/trunk/src/build@260313 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

all.gyp

@@ -362,7 +362,7 @@
             'chromium_swarm_tests',
           ],
         }],
-        ['OS!="android" and OS!="ios"', {
+        ['OS!="android"', {
           'dependencies': [
             '../google_apis/gcm/gcm.gyp:gcm_unit_tests',
           ],