Run automatic Java 8 conversion over codebase

-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=171174380

java/google/registry/request/Modules.java

@@ -128,12 +128,7 @@ public final class Modules {
   public static final class AppIdentityCredentialModule {
     @Provides
     static Function<Set<String>, AppIdentityCredential> provideAppIdentityCredential() {
-      return new Function<Set<String>, AppIdentityCredential>() {
-        @Override
-        public AppIdentityCredential apply(Set<String> scopes) {
-          return new AppIdentityCredential(scopes);
-        }
-      };
+      return AppIdentityCredential::new;
     }
   }
 
@@ -200,12 +195,7 @@ public final class Modules {
     @Provides
     static Function<Set<String>, GoogleCredential> provideScopedGoogleCredential(
         final Provider<GoogleCredential> googleCredentialProvider) {
-      return new Function<Set<String>, GoogleCredential>() {
-        @Override
-        public GoogleCredential apply(Set<String> scopes) {
-          return googleCredentialProvider.get().createScoped(scopes);
-        }
-      };
+      return scopes -> googleCredentialProvider.get().createScoped(scopes);
     }
 
     /**

java/google/registry/request/Router.java

@@ -95,21 +95,19 @@ final class Router {
   }
 
   private static Function<Object, ?> newInstantiator(final Method method) {
-    return new Function<Object, Object>() {
-      @Override
-      public Object apply(Object component) {
-        try {
-          return method.invoke(component);
-        } catch (IllegalAccessException e) {
-          throw new RuntimeException(
-              "Error reflectively accessing component's @Action factory method", e);
-        } catch (InvocationTargetException e) {
-          // This means an exception was thrown during the injection process while instantiating
-          // the @Action class; we should propagate that underlying exception.
-          throwIfUnchecked(e.getCause());
-          throw new AssertionError(
-              "Component's @Action factory method somehow threw checked exception", e);
-        }
-      }};
+    return component -> {
+      try {
+        return method.invoke(component);
+      } catch (IllegalAccessException e) {
+        throw new RuntimeException(
+            "Error reflectively accessing component's @Action factory method", e);
+      } catch (InvocationTargetException e) {
+        // This means an exception was thrown during the injection process while instantiating
+        // the @Action class; we should propagate that underlying exception.
+        throwIfUnchecked(e.getCause());
+        throw new AssertionError(
+            "Component's @Action factory method somehow threw checked exception", e);
+      }
+    };
   }
 }

java/google/registry/request/RouterDisplayHelper.java

@@ -14,10 +14,11 @@
 
 package google.registry.request;
 
-import com.google.common.base.Function;
+import static java.util.stream.Collectors.joining;
+
 import com.google.common.base.Joiner;
-import com.google.common.collect.FluentIterable;
 import com.google.common.collect.ImmutableMap;
+import com.google.common.collect.Streams;
 import java.util.Map;
 
 /**
@@ -139,14 +140,8 @@ public class RouterDisplayHelper {
                 .build());
     return headerToString(formatString)
         + String.format("%n")
-        + FluentIterable.from(routes)
-            .transform(
-                new Function<Route, String>() {
-                  @Override
-                  public String apply(Route route) {
-                    return routeToString(route, formatString);
-                  }
-                })
-            .join(Joiner.on(String.format("%n")));
+        + Streams.stream(routes)
+            .map(route -> routeToString(route, formatString))
+            .collect(joining(String.format("%n")));
   }
 }