Use ConfigContainer.copyOf instead of creating a new method.

Author: danasilver

firebase-config/src/main/java/com/google/firebase/remoteconfig/internal/ConfigContainer.java

@@ -139,10 +139,6 @@ public long getTemplateVersionNumber() {
     return templateVersionNumber;
   }
 
-  public ConfigContainer getCopy() throws JSONException {
-    return ConfigContainer.copyOf(containerJson);
-  }
-
   @Override
   public String toString() {
     return containerJson.toString();
@@ -168,7 +164,7 @@ public boolean equals(Object o) {
    */
   public Set<String> getChangedParams(ConfigContainer other) throws JSONException {
     // Make a copy of the other config before modifying it
-    JSONObject otherConfig = other.getCopy().getConfigs();
+    JSONObject otherConfig = ConfigContainer.copyOf(other.containerJson).getConfigs();
 
     // Experiments aren't associated with params, so we can just compare arrays once
     Boolean experimentsChanged = !this.getAbtExperiments().equals(other.getAbtExperiments());