[Media Router] Convert MediaRouter to use GURL for presentation URLs.

chrome/browser/media/router/mojo/media_router_mojo_impl_unittest.cc

 // 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.
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <memory>
 #include <string>
 #include <utility>
@@ skipping 1064 matching lines @@
   run_loop.Run();  // Will quit when StartListeningForRouteMessages() is called.
   router()->OnRouteMessagesReceived(expected_route_id, incoming_batch1);
   router()->OnRouteMessagesReceived(expected_route_id, incoming_batch2);
   router()->OnRouteMessagesReceived(expected_route_id, incoming_batch3);
   // As each |observer| goes out-of-scope, its destructor will ensure all
   // expected messages have been received.
 }
 
 TEST_F(MediaRouterMojoImplTest, PresentationConnectionStateChangedCallback) {
   MediaRoute::Id route_id("route-id");
-  const std::string kPresentationUrl("http://foo.fakeUrl");
+  const GURL presentation_url("http://www.example.com/presentation.html");
   const std::string kPresentationId("pid");
-  content::PresentationSessionInfo connection(kPresentationUrl,
+  content::PresentationSessionInfo connection(presentation_url,
                                               kPresentationId);
   MockPresentationConnectionStateChangedCallback callback;
   std::unique_ptr<PresentationConnectionStateSubscription> subscription =
       router()->AddPresentationConnectionStateChangedCallback(
           route_id,
           base::Bind(&MockPresentationConnectionStateChangedCallback::Run,
                      base::Unretained(&callback)));
 
   {
     base::RunLoop run_loop;
@@ skipping 467 matching lines @@
   EXPECT_CALL(mock_media_route_provider_,
               UpdateMediaSinks(MediaSourceForDesktop().id()))
       .WillOnce(InvokeWithoutArgs([&run_loop2]() {
         run_loop2.Quit();
       }));
 
   run_loop2.Run();
 }
 
 }  // namespace media_router