Don't declare parameter of type Iterable<Path>

java.file.nio.Path implements Iterable<Path>, and provides an iterator
over the name elements of the path. Declaring a parameter of type
Iterable<Path> is not recommended as it allows callers to pass either
an Iterable of Paths, or a single Path. Using Collection<Path>
prevents callers from accidentally passing a single Path.

Change-Id: Iade69324698adaac7f2f50e1c97f956397cf11e4

gerrit-common/src/main/java/com/google/gerrit/common/IoUtil.java

@@ -26,6 +26,7 @@ import java.net.URL;
 import java.net.URLClassLoader;
 import java.nio.file.Path;
 import java.util.Arrays;
+import java.util.Collection;
 import java.util.Collections;
 import java.util.Set;
 
@@ -54,7 +55,7 @@ public final class IoUtil {
     }.start();
   }
 
-  public static void loadJARs(Iterable<Path> jars) {
+  public static void loadJARs(Collection<Path> jars) {
     ClassLoader cl = IoUtil.class.getClassLoader();
     if (!(cl instanceof URLClassLoader)) {
       throw noAddURL("Not loaded by URLClassLoader", null);