NoState Prefetch: nostate prefetch browser tests.

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 56 matching lines @@
         const content::Referrer& referrer,
         Origin origin) = 0;
 
    private:
     DISALLOW_COPY_AND_ASSIGN(Factory);
   };
 
   class Observer {
    public:
     // Signals that the prerender has started running.
-    virtual void OnPrerenderStart(PrerenderContents* contents) = 0;
+    virtual void OnPrerenderStart(PrerenderContents* contents);
 
     // Signals that the prerender has had its load event.
     virtual void OnPrerenderStopLoading(PrerenderContents* contents);
 
     // Signals that the prerender has had its 'DOMContentLoaded' event.
     virtual void OnPrerenderDomContentLoaded(PrerenderContents* contents);
 
     // Signals that the prerender has stopped running. A PrerenderContents with
     // an unset final status will always call OnPrerenderStop before being
     // destroyed.
-    virtual void OnPrerenderStop(PrerenderContents* contents) = 0;
+    virtual void OnPrerenderStop(PrerenderContents* contents);
 
    protected:
     Observer();
     virtual ~Observer() = 0;
   };
 
   ~PrerenderContents() override;
 
   // All observers of a PrerenderContents are removed after the OnPrerenderStop
   // event is sent, so there is no need to call RemoveObserver() in the normal
@@ skipping 268 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_