Add a fuzzer test for the Clear-Site-Data header.

content/browser/browsing_data/clear_site_data_throttle.h

 // Copyright 2016 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 CONTENT_BROWSER_BROWSING_DATA_CLEAR_SITE_DATA_THROTTLE_H_
 #define CONTENT_BROWSER_BROWSING_DATA_CLEAR_SITE_DATA_THROTTLE_H_
 
 #include <memory>
 #include <vector>
 
@@ skipping 26 matching lines @@
       NavigationHandle* handle);
 
   ~ClearSiteDataThrottle() override;
 
   // NavigationThrottle implementation:
   ThrottleCheckResult WillStartRequest() override;
   ThrottleCheckResult WillRedirectRequest() override;
   ThrottleCheckResult WillProcessResponse() override;
 
  private:
+  friend class ClearSiteDataFuzzerTest;
   friend class ClearSiteDataThrottleTest;
   FRIEND_TEST_ALL_PREFIXES(ClearSiteDataThrottleTest, ParseHeader);
   FRIEND_TEST_ALL_PREFIXES(ClearSiteDataThrottleTest, InvalidHeader);
 
   explicit ClearSiteDataThrottle(NavigationHandle* navigation_handle);
 
   // Scans for the first occurrence of the 'Clear-Site-Data' header, calls
   // ParseHeader() to parse it, and requests the actual data clearing. This is
   // the common logic of WillRedirectRequest() and WillProcessResponse().
   void HandleHeader();
@@ skipping 25 matching lines @@
 
   // Needed for asynchronous parsing and deletion tasks.
   base::WeakPtrFactory<ClearSiteDataThrottle> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(ClearSiteDataThrottle);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_BROWSING_DATA_CLEAR_SITE_DATA_THROTTLE_H_