Inline Constants.IOS_DEVICE_RULE_CLASSES.

--
MOS_MIGRATED_REVID=101769828
diff --git a/src/main/java/com/google/devtools/build/lib/Constants.java b/src/main/java/com/google/devtools/build/lib/Constants.java
index 7787f47..9f9d2f9 100644
--- a/src/main/java/com/google/devtools/build/lib/Constants.java
+++ b/src/main/java/com/google/devtools/build/lib/Constants.java
@@ -43,11 +43,6 @@
   public static final ImmutableList<String> BASELINE_COVERAGE_OFFLINE_INSTRUMENTATION_SUFFIXES =
       ImmutableList.<String>of();
 
-  /**
-   * Rule classes which specify iOS devices for running tests.
-   */
-  public static final ImmutableSet<String> IOS_DEVICE_RULE_CLASSES = ImmutableSet.of("ios_device");
-
   public static final String ANDROID_DEFAULT_SDK = "//external:android/sdk".toString();
   public static final String ANDROID_DEFAULT_CROSSTOOL = "//external:android/crosstool".toString();
   public static final ImmutableList<String> ANDROID_DEFAULT_FAT_APK_CPUS =
diff --git a/src/main/java/com/google/devtools/build/lib/rules/objc/ExperimentalIosTestRule.java b/src/main/java/com/google/devtools/build/lib/rules/objc/ExperimentalIosTestRule.java
index 8e1cbe5..8860397 100644
--- a/src/main/java/com/google/devtools/build/lib/rules/objc/ExperimentalIosTestRule.java
+++ b/src/main/java/com/google/devtools/build/lib/rules/objc/ExperimentalIosTestRule.java
@@ -21,7 +21,6 @@
 import static com.google.devtools.build.lib.packages.Type.STRING_LIST;
 
 import com.google.common.collect.ImmutableList;
-import com.google.devtools.build.lib.Constants;
 import com.google.devtools.build.lib.analysis.BaseRuleClasses;
 import com.google.devtools.build.lib.analysis.RuleDefinition;
 import com.google.devtools.build.lib.analysis.RuleDefinitionEnvironment;
@@ -62,7 +61,7 @@
         .override(
             attr(IosTest.TARGET_DEVICE, LABEL)
                 .allowedFileTypes()
-                .allowedRuleClasses(Constants.IOS_DEVICE_RULE_CLASSES)
+                .allowedRuleClasses("ios_device")
                 .value(env.getLabel("//tools/objc/sim_devices:default")))
         /* <!-- #BLAZE_RULE(experimental_ios_test).ATTRIBUTE(ios_test_target_device) -->
          The device against how to run the test. If this attribute is defined, the test will run on