Update ErrorProne to 2.2.0 and fix failures

benchmarks/src/main/java/io/grpc/benchmarks/qps/AbstractConfigurationBuilder.java

@@ -212,7 +212,7 @@ public abstract class AbstractConfigurationBuilder<T extends Configuration>
   private static String wordWrap(String text, int startPos, int maxPos) {
     StringBuilder builder = new StringBuilder();
     int pos = startPos;
-    String[] parts = text.split("\\n");
+    String[] parts = text.split("\\n", -1);
     boolean isBulleted = parts.length > 1;
     for (String part : parts) {
       int lineStart = startPos;

build.gradle

@@ -35,7 +35,7 @@ subprojects {
       dependencies {
         // The ErrorProne plugin defaults to the latest, which would break our
         // build if error prone releases a new version with a new check
-        errorprone 'com.google.errorprone:error_prone_core:2.1.3'
+        errorprone 'com.google.errorprone:error_prone_core:2.2.0'
         apt 'com.google.guava:guava-beta-checker:1.0'
       }
     } else {

core/src/main/java/io/grpc/internal/Http2ClientStreamTransportState.java

@@ -226,7 +226,7 @@ public abstract class Http2ClientStreamTransportState extends AbstractClientStre
   private static Charset extractCharset(Metadata headers) {
     String contentType = headers.get(GrpcUtil.CONTENT_TYPE_KEY);
     if (contentType != null) {
-      String[] split = contentType.split("charset=");
+      String[] split = contentType.split("charset=", 2);
       try {
         return Charset.forName(split[split.length - 1].trim());
       } catch (Exception t) {

interop-testing/src/main/java/io/grpc/testing/integration/AbstractInteropTest.java

@@ -1725,7 +1725,8 @@ public abstract class AbstractInteropTest {
     try {
       certificates = Arrays.asList(sslSession.getPeerCertificates());
     } catch (SSLPeerUnverifiedException e) {
-      fail("No cert");
+      // Should never happen
+      throw new AssertionError(e);
     }
 
     X509Certificate x509cert = (X509Certificate) certificates.get(0);