[Media Router] Consistently refer to issue's learn more help page by ID.

chrome/browser/media/router/issue_manager_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 <string>
 #include <vector>
 
 #include "base/macros.h"
 #include "chrome/browser/media/router/issue_manager.h"
 #include "testing/gmock/include/gmock/gmock.h"
 
 namespace media_router {
 namespace {
 
 const char kTestRouteId[] = "routeId";
 
 Issue CreateTestIssue(const std::string& route_id) {
   return Issue("title", "message", IssueAction(IssueAction::TYPE_DISMISS),
                std::vector<IssueAction>(), route_id, Issue::WARNING, false,
-               "http://www.example.com/help");
+               12345);
 }
 
 class IssueManagerUnitTest : public ::testing::Test {
  protected:
   IssueManagerUnitTest() {}
   ~IssueManagerUnitTest() override {}
 
   IssueManager manager_;
 
  private:
@@ skipping 104 matching lines @@
   manager_.ClearIssuesWithRouteId(route_id_one);
   EXPECT_EQ(20u, manager_.GetIssueCount());
 
   // Remove all routes with route_id_two.
   manager_.ClearIssuesWithRouteId(route_id_two);
   EXPECT_EQ(10u, manager_.GetIssueCount());
 }
 
 }  // namespace
 }  // namespace media_router