Convert dom_distiller::WebContentsMainFrameObserver to use the new navigation callbacks.

content/public/browser/navigation_handle.h

 // Copyright 2015 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_PUBLIC_BROWSER_NAVIGATION_HANDLE_H_
 #define CONTENT_PUBLIC_BROWSER_NAVIGATION_HANDLE_H_
 
 #include <memory>
 #include <string>
 
@@ skipping 200 matching lines @@
   virtual const GlobalRequestID& GetGlobalRequestID() = 0;
 
   // Testing methods ----------------------------------------------------------
   //
   // The following methods should be used exclusively for writing unit tests.
 
   static std::unique_ptr<NavigationHandle> CreateNavigationHandleForTesting(
       const GURL& url,
       RenderFrameHost* render_frame_host,
       bool committed = false,
-      net::Error error = net::OK);
+      net::Error error = net::OK,
+      bool is_same_page = false);
 
   // Registers a NavigationThrottle for tests. The throttle can
   // modify the request, pause the request or cancel the request. This will
   // take ownership of the NavigationThrottle.
   // Note: in non-test cases, NavigationThrottles should not be added directly
   // but returned by the implementation of
   // ContentBrowserClient::CreateThrottlesForNavigation. This ensures proper
   // ordering of the throttles.
   virtual void RegisterThrottleForTesting(
       std::unique_ptr<NavigationThrottle> navigation_throttle) = 0;
@@ skipping 24 matching lines @@
 
   // The NavigationData that the embedder returned from
   // ResourceDispatcherHostDelegate::GetNavigationData during commit. This will
   // be a clone of the NavigationData.
   virtual NavigationData* GetNavigationData() = 0;
 };
 
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_BROWSER_NAVIGATION_HANDLE_H_