JDK-8250768: javac should be adapted to changes in JEP 12

src/jdk.javadoc/share/classes/jdk/javadoc/internal/doclets/formats/html/Navigation.java

@@ -296,7 +296,7 @@ private void addMainNavLinks(Content tree) {
                 }
                 if (documentedPage == PageMode.PREVIEW) {
                     addActivePageLink(tree, contents.previewLabel,
-                            configuration.conditionalPages.contains(HtmlConfiguration.ConditionalPage.DEPRECATED));
+                            configuration.conditionalPages.contains(HtmlConfiguration.ConditionalPage.PREVIEW));
                 } else {
                     addPreviewLink(tree);
                 }

src/jdk.javadoc/share/classes/jdk/javadoc/internal/doclets/formats/html/SummaryListWriter.java

@@ -115,6 +115,7 @@ private String getHeaderKey(SummaryElementKind kind) {
         };
     }
 
+    private final PageMode pageMode;
     private final String description;
     private final Content headContent;
     private final String titleKey;
@@ -134,6 +135,7 @@ public SummaryListWriter(HtmlConfiguration configuration, DocPath filename,
                              PageMode pageMode, String description,
                              Content headContent, String titleKey) {
         super(configuration, filename);
+        this.pageMode = pageMode;
         this.description = description;
         this.headContent = headContent;
         this.titleKey = titleKey;
@@ -209,7 +211,7 @@ public Content getContentsList(L apisummary) {
     public HtmlTree getHeader() {
         String title = resources.getText(titleKey);
         HtmlTree bodyTree = getBody(getWindowTitle(title));
-        bodyContents.setHeader(getHeader(PageMode.DEPRECATED));
+        bodyContents.setHeader(getHeader(pageMode));
         return bodyTree;
     }