Replace anonymous classes with lambdas

Change-Id: I860562d8bc039f278f6b982258a08c4a1495edb7

src/main/java/com/googlesource/gerrit/plugins/webhooks/DefaultHttpClientProvider.java

diff --git a/src/main/java/com/googlesource/gerrit/plugins/webhooks/DefaultHttpClientProvider.java b/src/main/java/com/googlesource/gerrit/plugins/webhooks/DefaultHttpClientProvider.java
index 5dc7ff3..46b48ae 100644
--- a/src/main/java/com/googlesource/gerrit/plugins/webhooks/DefaultHttpClientProvider.java
+++ b/src/main/java/com/googlesource/gerrit/plugins/webhooks/DefaultHttpClientProvider.java
@@ -43,17 +43,13 @@
   }
 
   private static Provider<Registry<ConnectionSocketFactory>> socketFactoryProvider() {
-    return new Provider<Registry<ConnectionSocketFactory>>() {
-      @Override
-      public Registry<ConnectionSocketFactory> get() {
-        return RegistryBuilder.<ConnectionSocketFactory>create()
+    return () ->
+        RegistryBuilder.<ConnectionSocketFactory>create()
             .register(
                 "https",
                 new SSLConnectionSocketFactory(buildSslContext(), NoopHostnameVerifier.INSTANCE))
             .register("http", PlainConnectionSocketFactory.INSTANCE)
             .build();
-      }
-    };
   }
 
   private static SSLContext buildSslContext() {

src/main/java/com/googlesource/gerrit/plugins/webhooks/SslVerifyingHttpClientProvider.java

diff --git a/src/main/java/com/googlesource/gerrit/plugins/webhooks/SslVerifyingHttpClientProvider.java b/src/main/java/com/googlesource/gerrit/plugins/webhooks/SslVerifyingHttpClientProvider.java
index 57e25a2..1d95639 100644
--- a/src/main/java/com/googlesource/gerrit/plugins/webhooks/SslVerifyingHttpClientProvider.java
+++ b/src/main/java/com/googlesource/gerrit/plugins/webhooks/SslVerifyingHttpClientProvider.java
@@ -32,16 +32,12 @@
   }
 
   private static Provider<Registry<ConnectionSocketFactory>> socketFactoryProvider() {
-    return new Provider<Registry<ConnectionSocketFactory>>() {
-      @Override
-      public Registry<ConnectionSocketFactory> get() {
-        return RegistryBuilder.<ConnectionSocketFactory>create()
+    return () ->
+        RegistryBuilder.<ConnectionSocketFactory>create()
             .register("https", SSLConnectionSocketFactory.getSocketFactory())
             // the following registration is added for case when one enables SSL verification
             // for HTTP remote
             .register("http", PlainConnectionSocketFactory.INSTANCE)
             .build();
-      }
-    };
   }
 }

src/test/java/com/googlesource/gerrit/plugins/webhooks/PostTaskTest.java

diff --git a/src/test/java/com/googlesource/gerrit/plugins/webhooks/PostTaskTest.java b/src/test/java/com/googlesource/gerrit/plugins/webhooks/PostTaskTest.java
index 4bcea8d..e5de105 100644
--- a/src/test/java/com/googlesource/gerrit/plugins/webhooks/PostTaskTest.java
+++ b/src/test/java/com/googlesource/gerrit/plugins/webhooks/PostTaskTest.java
@@ -33,9 +33,7 @@
 import org.junit.Test;
 import org.junit.runner.RunWith;
 import org.mockito.Mock;
-import org.mockito.invocation.InvocationOnMock;
 import org.mockito.junit.MockitoJUnitRunner;
-import org.mockito.stubbing.Answer;
 
 @RunWith(MockitoJUnitRunner.class)
 public class PostTaskTest {
@@ -116,12 +114,9 @@
     when(session.post(eq(remote), eq(content))).thenThrow(IOException.class);
     when(executor.schedule(task, RETRY_INTERVAL, TimeUnit.MILLISECONDS))
         .then(
-            new Answer<Void>() {
-              @Override
-              public Void answer(InvocationOnMock invocation) throws Throwable {
-                task.run();
-                return null;
-              }
+            invocation -> {
+              task.run();
+              return null;
             });
     task.run();
     verify(executor, times(MAX_TRIES - 1)).schedule(task, RETRY_INTERVAL, TimeUnit.MILLISECONDS);