Promote ios-device-xcode-clang, ios-simulator-xcode-clang to the commit queue

BUG=661612

Review-Url: https://codereview.chromium.org/2550063003
Cr-Commit-Position: refs/heads/master@{#437733}

infra/config/cq.cfg

@@ -66,15 +66,9 @@ verifiers {
     buckets {
       name: "master.tryserver.chromium.mac"
       builders { name: "ios-device" }
-      builders {
-        name: "ios-device-xcode-clang"
-        experiment_percentage: 50
-      }
+      builders { name: "ios-device-xcode-clang" }
       builders { name: "ios-simulator" }
-      builders {
-        name: "ios-simulator-xcode-clang"
-        experiment_percentage: 50
-      }
+      builders { name: "ios-simulator-xcode-clang" }
       builders { name: "mac_chromium_compile_dbg_ng" }
       builders { name: "mac_chromium_rel_ng" }
       builders {