Make JavaFormatterOptions' constructor private

MOE_MIGRATED_REVID=124791866
diff --git a/core/src/main/java/com/google/googlejavaformat/java/JavaFormatterOptions.java b/core/src/main/java/com/google/googlejavaformat/java/JavaFormatterOptions.java
index 8f74bac..a86b4ad 100644
--- a/core/src/main/java/com/google/googlejavaformat/java/JavaFormatterOptions.java
+++ b/core/src/main/java/com/google/googlejavaformat/java/JavaFormatterOptions.java
@@ -87,9 +87,7 @@
   private final JavadocFormatter javadocFormatter;
   private final Style style;
 
-  /** @deprecated use {@link #builder()} instead of constructing instances directly. */
-  @Deprecated // TODO(cushon): migrate to builder and make private
-  public JavaFormatterOptions(JavadocFormatter javadocFormatter, Style style) {
+  private JavaFormatterOptions(JavadocFormatter javadocFormatter, Style style) {
     this.javadocFormatter = javadocFormatter;
     this.style = style;
   }
diff --git a/core/src/main/java/com/google/googlejavaformat/java/RemoveUnusedImports.java b/core/src/main/java/com/google/googlejavaformat/java/RemoveUnusedImports.java
index 41bc91b..8c74fe8 100644
--- a/core/src/main/java/com/google/googlejavaformat/java/RemoveUnusedImports.java
+++ b/core/src/main/java/com/google/googlejavaformat/java/RemoveUnusedImports.java
@@ -25,7 +25,6 @@
 import com.google.common.collect.TreeRangeMap;
 import com.google.common.collect.TreeRangeSet;
 import com.google.googlejavaformat.java.JavaFormatterOptions.JavadocFormatter;
-import com.google.googlejavaformat.java.JavaFormatterOptions.Style;
 
 import org.eclipse.jdt.core.JavaCore;
 import org.eclipse.jdt.core.dom.AST;
@@ -215,7 +214,10 @@
     if (!fixedRanges.isEmpty()) {
       try {
         result =
-            new Formatter(new JavaFormatterOptions(JavadocFormatter.GOOGLE, Style.GOOGLE))
+            new Formatter(
+                    JavaFormatterOptions.builder()
+                        .javadocFormatter(JavadocFormatter.GOOGLE)
+                        .build())
                 .formatSource(result, fixedRanges.asRanges());
       } catch (FormatterException e) {
         // javadoc reformatting is best-effort