Fix for double header and footer on ndk download pages: b/27950742

https://android-dot-devsite.googleplex.com/ndk/downloads/index.html

Fix for html code in page title and h1 tag: b/28237039
https://android-dot-devsite.googleplex.com/guide/topics/manifest/manifest-element.html

Change-Id: Idc9ba0a1ba33d1b89b7dbfd3d620d0e587c57459

tools/droiddoc/templates-sdk-dev/head_tag.cs

@@ -127,7 +127,7 @@
 <title><?cs
 if:devsite ?><?cs
   if:page.title ?><?cs
-    var:page.title ?><?cs
+    var:html_strip(page.title) ?><?cs
   else ?>Android Developers<?cs
   /if ?><?cs
 else ?><?cs

tools/droiddoc/templates-sdk-dev/sdkpage.cs

@@ -46,7 +46,7 @@
 #
 ?>
 
-<?cs if:header.hide ?><?cs else ?>
+<?cs if:(header.hide||devsite)?><?cs else ?>
 <h1 itemprop="name"><?cs var:page.title ?></h1>
 <?cs /if ?>
   <div id="jd-content" itemprop="description">
@@ -574,7 +574,7 @@ tools release notes</a>.</p>
 
 </div><!-- end jd-content -->
 
-<?cs if:!sdk.redirect ?>
+<?cs if:!sdk.redirect && !devsite ?>
 <?cs include:"footer.cs" ?>
 <?cs /if ?>
 
@@ -599,6 +599,3 @@ document.write('<iframe src="https://2507573.fls.doubleclick.net/activityi;src=2
 <!-- End of Tag -->
 </body>
 </html>
-
-
-