[Chromecast] ConnectivityChecker improvements.

Remove redefinition of observer list in impl class. Move observer
list into private in base class and expose a protected Notify
method.

BUG=
R=gunsch@chromium.org,byungchul@chromium.org

Review URL: https://codereview.chromium.org/1169533002

Cr-Commit-Position: refs/heads/master@{#332643}

5 files changed, 17 insertions, 11 deletions

diff --git a/chromecast/net/connectivity_checker.cc b/chromecast/net/connectivity_checker.cc
index 16417ab..873ab1e 100644
--- a/chromecast/net/connectivity_checker.cc
+++ b/chromecast/net/connectivity_checker.cc
@@ -26,6 +26,12 @@ void ConnectivityChecker::RemoveConnectivityObserver(
   connectivity_observer_list_->RemoveObserver(observer);
 }
 
+void ConnectivityChecker::Notify(bool connected) {
+  DCHECK(connectivity_observer_list_.get());
+  connectivity_observer_list_->Notify(
+      FROM_HERE, &ConnectivityObserver::OnConnectivityChanged, connected);
+}
+
 // static
 scoped_refptr<ConnectivityChecker> ConnectivityChecker::Create(
     const scoped_refptr<base::SingleThreadTaskRunner>& task_runner) {
diff --git a/chromecast/net/connectivity_checker.h b/chromecast/net/connectivity_checker.h
index 0c843a0..6225962 100644
--- a/chromecast/net/connectivity_checker.h
+++ b/chromecast/net/connectivity_checker.h
@@ -23,7 +23,7 @@ class ConnectivityChecker
  public:
   class ConnectivityObserver {
    public:
-    // Will be called when internet connectivity changes
+    // Will be called when internet connectivity changes.
     virtual void OnConnectivityChanged(bool connected) = 0;
 
    protected:
@@ -42,20 +42,24 @@ class ConnectivityChecker
   void AddConnectivityObserver(ConnectivityObserver* observer);
   void RemoveConnectivityObserver(ConnectivityObserver* observer);
 
-  // Returns if there is internet connectivity
+  // Returns if there is internet connectivity.
   virtual bool Connected() const = 0;
 
-  // Checks for connectivity
+  // Checks for connectivity.
   virtual void Check() = 0;
 
  protected:
   virtual ~ConnectivityChecker();
-  const scoped_refptr<base::ObserverListThreadSafe<ConnectivityObserver>>
-      connectivity_observer_list_;
+
+  // Notifies observes that connectivity has changed.
+  void Notify(bool connected);
 
  private:
   friend class base::RefCountedThreadSafe<ConnectivityChecker>;
 
+  const scoped_refptr<ObserverListThreadSafe<ConnectivityObserver>>
+      connectivity_observer_list_;
+
   DISALLOW_COPY_AND_ASSIGN(ConnectivityChecker);
 };
 
diff --git a/chromecast/net/connectivity_checker_impl.cc b/chromecast/net/connectivity_checker_impl.cc
index f17a73f..3ca50c1 100644
--- a/chromecast/net/connectivity_checker_impl.cc
+++ b/chromecast/net/connectivity_checker_impl.cc
@@ -81,8 +81,7 @@ void ConnectivityCheckerImpl::SetConnected(bool connected) {
     return;
 
   connected_ = connected;
-  connectivity_observer_list_->Notify(
-      FROM_HERE, &ConnectivityObserver::OnConnectivityChanged, connected);
+  Notify(connected);
   LOG(INFO) << "Global connection is: " << (connected ? "Up" : "Down");
 }
 
diff --git a/chromecast/net/connectivity_checker_impl.h b/chromecast/net/connectivity_checker_impl.h
index 6ebe718..8bf4494 100644
--- a/chromecast/net/connectivity_checker_impl.h
+++ b/chromecast/net/connectivity_checker_impl.h
@@ -71,8 +71,6 @@ class ConnectivityCheckerImpl
   scoped_ptr<GURL> connectivity_check_url_;
   scoped_ptr<net::URLRequestContext> url_request_context_;
   scoped_ptr<net::URLRequest> url_request_;
-  const scoped_refptr<ObserverListThreadSafe<ConnectivityObserver> >
-      connectivity_observer_list_;
   const scoped_refptr<base::SingleThreadTaskRunner> task_runner_;
   bool connected_;
   // Number of connectivity check errors.
diff --git a/chromecast/net/fake_connectivity_checker.cc b/chromecast/net/fake_connectivity_checker.cc
index 7b97d8a..fc3caed 100644
--- a/chromecast/net/fake_connectivity_checker.cc
+++ b/chromecast/net/fake_connectivity_checker.cc
@@ -25,8 +25,7 @@ void FakeConnectivityChecker::SetConnectedForTest(bool connected) {
     return;
 
   connected_ = connected;
-  connectivity_observer_list_->Notify(
-      FROM_HERE, &ConnectivityObserver::OnConnectivityChanged, connected);
+  Notify(connected);
 }
 
 }  // namespace chromecast