Use try-with-resources statements

- instead of finally blocks
- in cases of missing try-finally

Change-Id: I94f481a33d8e6a3180c436245d6e95e4d525280c

gerrit-gwtexpui/src/main/java/com/google/gwtexpui/css/rebind/CssLinker.java

@@ -77,19 +77,14 @@ public class CssLinker extends AbstractLinker {
 
   private String name(final TreeLogger logger, final PublicResource r)
       throws UnableToCompleteException {
-    final InputStream in = r.getContents(logger);
     final ByteArrayOutputStream tmp = new ByteArrayOutputStream();
-    try {
-      try {
-        final byte[] buf = new byte[2048];
-        int n;
-        while ((n = in.read(buf)) >= 0) {
-          tmp.write(buf, 0, n);
-        }
-        tmp.close();
-      } finally {
-        in.close();
+    try (InputStream in = r.getContents(logger)) {
+      final byte[] buf = new byte[2048];
+      int n;
+      while ((n = in.read(buf)) >= 0) {
+        tmp.write(buf, 0, n);
       }
+      tmp.close();
     } catch (IOException e) {
       final UnableToCompleteException ute = new UnableToCompleteException();
       ute.initCause(e);