[NoStatePrefetch] Support only GET and HEAD

chrome/browser/prerender/prerender_manager.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CHROME_BROWSER_PRERENDER_PRERENDER_MANAGER_H_
 #define CHROME_BROWSER_PRERENDER_PRERENDER_MANAGER_H_
 
 #include <stdint.h>
 
 #include <memory>
@@ skipping 241 matching lines @@
   // Destroy()ed, but not yet deleted.
   virtual PrerenderContents* GetPrerenderContentsForRoute(
       int child_id, int route_id) const;
 
   // Returns a list of all WebContents being prerendered.
   std::vector<content::WebContents*> GetAllPrerenderingContents() const;
 
   // 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);
 
   // Returns true iff the scheme of the subresource URL given is valid for
   // prerendering.
   static bool DoesSubresourceURLHaveValidScheme(const GURL& url);
 
   // Returns a Value object containing the active pages being prerendered, and
   // a history of pages which were prerendered.
   std::unique_ptr<base::DictionaryValue> GetAsValue() const;
@@ skipping 313 matching lines @@
   PrerenderProcessSet prerender_process_hosts_;
 
   base::WeakPtrFactory<PrerenderManager> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(PrerenderManager);
 };
 
 }  // namespace prerender
 
 #endif  // CHROME_BROWSER_PRERENDER_PRERENDER_MANAGER_H_