[NoStatePrefetch] Support only GET and HEAD

chrome/browser/prerender/prerender_contents.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_CONTENTS_H_
 #define CHROME_BROWSER_PRERENDER_PRERENDER_CONTENTS_H_
 
 #include <stdint.h>
 
 #include <memory>
@@ skipping 89 matching lines @@
   void AddObserver(Observer* observer);
   void RemoveObserver(Observer* observer);
 
   bool Init();
 
   // Set the mode of this contents. This must be called before prerender has
   // started.
   void SetPrerenderMode(PrerenderMode mode);
   PrerenderMode prerender_mode() const { return prerender_mode_; }
 
+  // Returns true iff the method given is valid for prerendering.
+  bool IsValidHttpMethod(const std::string& method);
+
   static Factory* CreateFactory();
 
   // Returns a PrerenderContents from the given web_contents, if it's used for
   // prerendering. Otherwise returns NULL. Handles a NULL input for
   // convenience.
   static PrerenderContents* FromWebContents(content::WebContents* web_contents);
 
   // Start rendering the contents in the prerendered state. If
   // |is_control_group| is true, this will go through some of the mechanics of
   // starting a prerender, without actually creating the RenderView. |bounds|
@@ skipping 244 matching lines @@
   // A running tally of the number of bytes this prerender has caused to be
   // transferred over the network for resources.  Updated with AddNetworkBytes.
   int64_t network_bytes_;
 
   DISALLOW_COPY_AND_ASSIGN(PrerenderContents);
 };
 
 }  // namespace prerender
 
 #endif  // CHROME_BROWSER_PRERENDER_PRERENDER_CONTENTS_H_