CommitValidators: Replace indexOf calls with String#contains

Partial cherry-pick of commit 249d47b done in order to make
subsequent cherry-picks cleaner.

Change-Id: I7288a18d38351ebe87aa8fc25b2c232310b1273f

1 files changed, 2 insertions, 2 deletions

diff --git a/gerrit-server/src/main/java/com/google/gerrit/server/git/validators/CommitValidators.java b/gerrit-server/src/main/java/com/google/gerrit/server/git/validators/CommitValidators.java
index 0eb781939e..6724ddeab6 100644
--- a/gerrit-server/src/main/java/com/google/gerrit/server/git/validators/CommitValidators.java
+++ b/gerrit-server/src/main/java/com/google/gerrit/server/git/validators/CommitValidators.java
@@ -290,9 +290,9 @@ public class CommitValidators {
       StringBuilder sb = new StringBuilder();
       sb.append("ERROR: ").append(errMsg);
 
-      if (c.getFullMessage().indexOf(CHANGE_ID_PREFIX) >= 0) {
+      if (c.getFullMessage().contains(CHANGE_ID_PREFIX)) {
         String lastLine = Iterables.getLast(Splitter.on('\n').split(c.getFullMessage()), "");
-        if (lastLine.indexOf(CHANGE_ID_PREFIX) == -1) {
+        if (!lastLine.contains(CHANGE_ID_PREFIX)) {
           sb.append('\n');
           sb.append('\n');
           sb.append("Hint: A potential ");