Simplify Path creation

-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=118594886

Author: cushon

core/src/main/java/com/google/googlejavaformat/java/FormatFileCallable.java

@@ -25,7 +25,6 @@
 import com.google.googlejavaformat.java.JavaFormatterOptions.SortImports;
 
 import java.io.BufferedOutputStream;
-import java.io.File;
 import java.io.FileOutputStream;
 import java.io.IOException;
 import java.io.InputStream;
@@ -35,6 +34,7 @@
 import java.io.Writer;
 import java.nio.charset.StandardCharsets;
 import java.nio.file.Files;
+import java.nio.file.Paths;
 import java.nio.file.StandardCopyOption;
 import java.util.ArrayList;
 import java.util.List;
@@ -236,8 +236,8 @@ private boolean writeOutput(Write write) {
       }
       try {
         Files.move(
-            new File(tempFileName).toPath(),
-            new File(fileToFormat.fileName()).toPath(),
+            Paths.get(tempFileName),
+            Paths.get(fileToFormat.fileName()),
             StandardCopyOption.REPLACE_EXISTING);
       } catch(IOException e) {
         synchronized (outputLock) {