[NoStatePrefetch] Support only GET and HEAD

chrome/browser/prerender/prerender_manager.h

Index: chrome/browser/prerender/prerender_manager.h
diff --git a/chrome/browser/prerender/prerender_manager.h b/chrome/browser/prerender/prerender_manager.h
index 103699eedc64ef4dcd650e7ccb01fdb4cdc4cfbd..8f335719c06c6326398d5fdc61287bfc8d1d3936 100644
--- a/chrome/browser/prerender/prerender_manager.h
+++ b/chrome/browser/prerender/prerender_manager.h
@@ -267,9 +267,6 @@ class PrerenderManager : public content::NotificationObserver,
   // Checks whether |url| has been recently navigated to.
   bool HasRecentlyBeenNavigatedTo(Origin origin, const GURL& url);
 
-  // Returns true iff the method given is valid for prerendering.
-  static bool IsValidHttpMethod(const std::string& method);
-
   // Returns true iff the scheme of the URL given is valid for prerendering.
   static bool DoesURLHaveValidScheme(const GURL& url);